ISRO VSSC Revised Answer Key 2026

ISRO VSSC Revised Answer Key 2026 Overview

Vikram Sarabhai Space Centre (VSSC), a major research centre of the Indian Space Research Organisation (ISRO), has published the revised answer key for the Computer-Based Test (CBT) conducted for Technician-B, Draughtsman-B, Scientist/Engineer-SC, and various other technical positions. Candidates who appeared for the examination on September 16, 2026, can now verify their submitted responses against the updated official solutions.

Understanding Provisional vs Revised and Final Answer Keys

An answer key serves as an official reference document containing the correct options for all questions asked in an examination. Examination authorities generally issue keys in stages to ensure transparency and accuracy in the evaluation process.

• Provisional Answer Key: Released immediately after the examination. It invites challenges or objections from candidates regarding incorrect questions or erroneous answer options within a stipulated timeframe.
• Revised Answer Key: Published after subject matter experts re-examine the provisional key alongside candidate challenges. Erroneous keys are corrected, and invalid questions are addressed.
• Final Answer Key: The definitive evaluation standard. The recruiting body prepares the final merit list and individual scorecards solely based on this key. No further disputes or representations are entertained after this stage.

Steps to Download ISRO VSSC Revised Answer Key 2026

Candidates can access their response sheets and the revised key by following this sequence on the official recruitment portal:

• Visit the official VSSC recruitment webpage at vssc.gov.in.
• Locate the link titled 'Recruitment Notices' or 'Answer Key for CBT Exam Held on 16 September 2026'.
• Click on the login portal for Technician-B, Draughtsman-B, or Scientist/Engineer-SC.
• Enter your registered Roll Number or Application Number along with your Date of Birth or Password.
• View your question paper, recorded responses, and revised official correct options.
• Download and save the PDF file for accurate score calculation.

How to Calculate Estimated Scores: Formula and Marking Scheme

To compute your raw score, apply the exact marking criteria outlined in the official notification. For instance, in posts where each correct answer carries 3 marks and an incorrect answer attracts a penalty of 1 mark (negative marking of 0.33 ratio), calculate using the standard formula:

Estimated Raw Score = (Total Correct Answers x Marks per Question) - (Total Incorrect Answers x Negative Penalty)

Note: Check post-specific notifications carefully, as Scientist/Engineer-SC posts and Technician-B posts may feature different total marks or negative marking ratios.

Section-Wise Comparison and Category Cut-Off Estimation

A section-by-section breakdown helps determine your competitive standing. Engineering and technical examinations typically balance core domain technical knowledge with general aptitude and mathematics. Analyze your performance in each section individually:

• Technical Discipline Section: High accuracy here is critical, as core technical knowledge usually holds the highest weightage in ISRO shortlisting criteria.
• General Aptitude and Mathematics: These sections often decide the margin for candidates near the qualification threshold.
• Category Benchmarks: Historical cut-off trends indicate that General (UR) candidates need substantially higher raw percentages (often 70% to 75% or more), while OBC/EWS categories typically benchmark slightly lower, and SC/ST/PwD categories reflect further adjusted criteria depending on vacancy distribution and seat reservations.

The Objection Submission Process: Protocol and Evaluation

During the challenge window of the provisional key, VSSC provides an online challenge module. While the revised key reflects the outcome of that initial process, understanding how challenges are handled is important:

• Portal: Objections are accepted strictly through the candidate login portal; offline letters or direct emails are disregarded.
• Processing Fee: A nominal non-refundable or conditionally refundable fee (such as Rs. 100 per challenged question) is charged per objection.
• Documentary Proof: Candidates must upload standard textbook references or authenticated technical documentation supporting their claim.
• Expert Committee: An independent panel of domain specialists reviews every challenge. If an error is substantiated, the correction applies uniformly to all test-takers, not just the applicant who raised the challenge.

Outcomes of Objections: Acceptance vs Rejection

If an Objection is Accepted

When the expert committee validates an objection, the answer key is updated. In cases where an option was originally marked wrong, the correct option is amended. If a question is found ambiguous, carries multiple correct options, or contains translation flaws, the committee either awards marks to all candidates who chose valid alternatives or cancels the question entirely, recalculating scores on a pro-rata basis.

If an Objection is Rejected

If the committee determines the original key was accurate, the challenge is dismissed and no changes are made. The expert committee's decision is final and legally binding. While candidates may file an application under the Right to Information (RTI) Act to inspect administrative processing details, RTI cannot be used to demand a re-evaluation of academic or technical judgments made by subject experts.

Judging Your Qualifying Chances Realistically

Avoid both unwarranted panic and early celebration when reviewing your calculated score:

• Compare your raw score with previous recruitment drives for the same specific trade or discipline.
• Consider exam difficulty levels: difficult technical papers naturally lower the overall cut-off range.
• Factor in stage-two requirements: Technician-B candidates must clear a qualifying Skill Test, whereas Scientist/Engineer candidates proceed to an in-depth technical interview. Focus your preparation on the next round if your raw score falls comfortably within typical qualifying ranges.

Common Mistakes to Avoid During Score Calculation

• Confusing question booklet sets or shifting response codes while cross-referencing your answers.
• Forgetting to subtract negative marks, which leads to an inflated score expectation.
• Counting dropped or cancelled questions as standard positive marks before verifying whether the board used full marks or pro-rata scaling.
• Misinterpreting system-marked ambiguous questions before official announcements verify the revised key.