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This guide provides a step-by-step breakdown of the DRDO 2026 online application process. It includes detailed guidelines on the required documents and file size, explains the ₹100 fee rules, and, most importantly, lists the most common reasons for rejected applications along with clear, copy-paste solutions to help you fix any issues before submission.

Just a quick note: The DRDO application process is managed by the Recruitment and Assessment Centre. Many vacancies for the Scientist ‘B’ position are filled using the national GATE score (details below). Make sure to carefully read the rejection reasons section; addressing these issues is where most applicants tend to struggle.

Why This Guide? – Problem and Solution Format

Problem: Many applicants complete the form but are then rejected or marked as ineligible due to small, avoidable errors, such as incorrect file sizes, mismatched names, incorrect fee status, or incomplete uploads.

Solution: Use the checklist and solutions provided in this article. Consider the “Common Rejection Reasons” section as a pre-flight checklist before you click “Submit.”

Short primer

Defence Research and Development Organisation (DRDO) – This is the main organization responsible for recruitment.

GATE (Graduate Aptitude Test in Engineering) – This test is used to shortlist candidates for many Scientist ‘B’ positions.

Institute for Systems Studies and Analyses – This is an example of a DRDO lab that offers apprenticeship programs.

National Apprenticeship Training Scheme – This scheme is used for eligibility and registration for apprenticeships.

These references provide context about the organizations involved. The guide will now use simpler names for clarity.

1) Exact application flow. ( Follow this exact application flow in the specified order (solution). )

Problem: Applicants often miss steps or upload files incorrectly. Please follow this exact sequence to avoid validation failures in the portal:

1. Register on the RAC portal using a valid email and mobile number. Make a note of your registration ID.
2. Verify email & mobile via OTP links. Ensure you wait for confirmation before proceeding.
3. Complete profile (personal, contact, education). Use the same spellings and date formats as on your certificates.
4. Enter GATE details (if applicable): GATE reg. no., year, score. Copy these exactly from your GATE scorecard.
5. Prepare and scan documents (see section 2 for specs). Name files methodically: lastname_firstname_doc.pdf.
6. Upload files in the portal’s required order (photo → signature → age proof → degree → marksheets → category/PwD → GATE). Be aware that some portals may lock the upload order, so it is important to follow the specified sequence.
7. Pay application fee (if not exempt). Save your UTR or transaction screenshots as proof of payment.
8. Preview & submit: check every field, then lock/submit. Download the confirmation/acknowledgement and save screenshots.

2) Document the rules. Specify the exact requirements that must be followed (solution).

Problem: Blurry images, oversized files, or incorrect formats can lead to automatic rejections.

Common document list:

• Recent passport photo
• Scanned signature on a white background
• 10th certificate (proof of age)
• 12th certificate (if applicable)
• Degree or diploma certificate along with semester mark sheets
• GATE scorecard (PDF format) if applying through GATE
• Category or PwD certificate (where applicable)
• NATS enrollment (for apprenticeship programs)

File Format and Size Guidelines

1. Photo: Use JPG format, with dimensions of 3.5 cm × 4.5 cm. The file size should be between 50–250 KB to ensure legibility.
2. Signature: Use either JPG or PNG format, with a file size of 50–100 KB and a resolution of 300 DPI.
3. Single-Page Certificates/Scorecards: These should be in either PDF or JPG format, with a maximum file size of 200 KB.
4. Multi-Page Mark Sheets: Combine all pages into one PDF with a total file size of 500 KB or less, if possible. Be aware that some portals may enforce stricter limits, requiring certain files to be between 15–40 KB. If you need to reduce file size, compress while ensuring the text remains readable.
5. Scanning Tips: Use color scans for photos and grayscale scans for text-only mark sheets; this can often reduce file size while maintaining acceptable legibility.

Practical compression steps

• Scan at 300 DPI in grayscale for text.
• Use “Save as PDF” and then use a reputable compressor (Adobe, SmallPDF, Ilovepdf).
• After compression, open and zoom at 100% to confirm readability.

3. Fee Rules: Who Pays and Who Is Exempt (Solution)

Issue: Incorrect fee payment or missing transaction reference.

• Standard Fee: ₹100 for General, OBC, and EWS male candidates (please confirm with the official notification).
• Exemptions: SC, ST, PwBD, and women candidates are generally exempt from the fee.
• Payment Methods: You can pay online using net banking, UPI, debit, or credit cards. Always save the UTR (Unique Transaction Reference) number or a screenshot of your payment confirmation.

Important Note: If the portal indicates that payment is unpaid but your bank account shows that the amount has been debited, please contact the helpdesk immediately. Be sure to provide your UTR, payment screenshot, and registration ID.

12 Common Reasons for Rejection and Their Solutions

This section highlights the most frequent reasons for rejection and provides specific fixes.

1. Name / DOB mismatch
   • Problem: Application name or DOB doesn’t match 10th certificate.
   • Fix: Edit the field to match the 10th certificate exactly. If the portal is locked, prepare affidavit/gazette and keep evidence for verification.
2. Incorrect GATE details
   • Problem: Wrong GATE registration number or paper.
   • Fix: Recheck scorecard and correct GATE reg. no. before submit. Save GATE PDF and upload.
3. Oversized or illegible files
   • Problem: Files exceed portal limits or are unreadable after compression.
   • Fix: Rescan at 300 DPI grayscale, compress, and verify readability at 100% zoom. Use lossless PDF compression for text.
4. Wrong file format
   • Problem: Portal expects PDF; you uploaded JPG.
   • Fix: Convert JPG to PDF for multi-page documents. Single image files (photo/signature) usually okay as JPG/PNG.
5. Payment status mismatch
   • Problem: Bank debited but portal shows unpaid.
   • Fix: Save UTR, transaction screenshot, email RAC helpdesk immediately with evidence.
6. Missing mandatory document
   • Problem: Didn’t upload degree or marksheet.
   • Fix: Revisit uploads, ensure each required document is attached, and include a brief note in the application where portal allows comments.
7. Category/PwD certificate not government format
   • Problem: Uploaded informal certificate or scanned low quality.
   • Fix: Upload the official certificate in standard government format with stamp & sign.
8. Multiple profile inconsistencies
   • Problem: Different spellings across forms (GATE vs. degree).
   • Fix: Standardize on the degree/10th certificate spelling. Keep supporting evidence for later verification.
9. Late submission / timezone confusion
   • Problem: Missed deadline due to local/UTC confusion.
   • Fix: Submit at least 48–72 hours earlier than the deadline.
10. Wrong order of uploads
    • Problem: Portal rejects because of upload sequence mismatch.
    • Fix: Re-upload in the exact order the portal lists. Clear browser cache if upload fails.
11. Email/OTP not verified
    • Problem: Application remains unverified.
    • Fix: Re-send OTP, check spam, or use a different email; contact helpdesk if OTP never arrives.
12. Incorrect file naming causing mismatch
    • Problem: Portal parsing fails with special characters.
    • Fix: Use only lowercase letters, numbers, and underscores for filenames: kumar_rahul_degree.pdf.

5) If your application is rejected, take these immediate steps:

1. Carefully read the rejection email or portal note, as it will specify the reason for the rejection.
2. If the issue is technical (such as payment or upload problems), collect evidence, including screenshots, UTR numbers, and compressed files, and email the helpdesk immediately.
3. If the rejection is due to a mismatch or documentary issues, prepare the necessary corrections (like an affidavit, gazette, or updated certificate) and inquire if there is a rectification window available.
4. If the deadline has passed and rectification is not allowed, save all evidence and prepare for the next cycle. Learn from the mistakes you made.

6) Sample helpdesk email (copy-paste)

Subject: RAC Portal – Payment/Upload Issue — Regn ID: [your_regn_id]
Body (paste & edit):

Name: [Your Full Name]  
Registration ID: [your_regn_id]  
Mobile: [your_mobile] | Email: [your_email]  
Problem: [brief one-line summary — e.g., "Payment debited but portal shows unpaid"]  
Attached: Payment screenshot / Confirmation page / Application preview  
Request: Please update payment status / allow re-upload / advise next steps.  
Regards,  
[Your Name]

7) Pre-Submission Checklist (Make a copy before submitting)

• Registration OTP has been verified.
• Personal details match those on the 10th certificate.
• GATE details have been entered and the GATE scorecard has been uploaded (if applicable).
• All documents have been uploaded and are readable at 100% zoom.
• Payment has been successfully processed (UTR saved).
• Confirmation PDF has been downloaded after submission.
• A draft email for the helpdesk is ready in case of any issues.

FAQ

Q: When will the admit card be released?
A: Admit card release dates are listed in the specific notification; check the RAC portal and registered email for updates.

Q: How will I receive communication from DRDO?
A: Primary communication is via email and the recruitment portal; shortlisted candidates are often emailed for next steps.

Q: Can I apply for multiple DRDO posts in the same cycle?
A: You can apply for more than one post if the notification allows multiple applications; pay attention to separate application requirements and fees.

Q: Where can I download the official notification PDF?
A: The official notification is available on DRDO’s recruitment portal and the concerned lab’s website—always use those links.

Final recommendations

Most rejections are due to small administrative errors. To improve your chances of success, treat the application as a mini-project. Start by preparing your documents, compressing and testing them, confirming your payment, and then submitting them early. By following the file-size and naming conventions and using the rejection checklist, you can address the most common points of failure.