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Many students who want a research career assume the Indian Institute of Science (IISc), Bengaluru, admits undergraduates through a separate entrance exam. It does not. Its Bachelor of Science (Research) uses ranks from exams you may already be taking, but it has its own eligibility rules and its own application. This post sets out the routes, works through the Class 12 percentage rule and lists the mistakes that cost applicants a seat.
What is the IISc BS (Research) programme?
The IISc undergraduate site describes a four-year, research-intensive programme, introduced in 2011, with broad training in the early years and then a major in Biology, Chemistry, Earth and Environmental Sciences, Mathematics or Physics. The programme FAQ adds that it runs over eight semesters, ends with a one-year research project and is taught in English. IISc also runs B.Tech programmes, which have a separate admission process not covered here.
According to the 2026 admission rules, the intake is 125: 100 seats for Indian nationals and OCI(I) candidates, 20 supernumerary seats for women (20%) and 5 for foreign nationals or OCI(F) candidates.
Which exams can you use to get in?
For Indian nationals, the selection process page lists two routes for 2026:
JEE Advanced
IISER Aptitude Test (IAT)
The FAQ explains that IISc uses the merit lists of these national exams instead of setting its own. A separate merit list is prepared for each exam, and a student who qualifies through both is placed on both lists. Foreign nationals can also apply with SAT or ACT scores followed by an interview. Our post on the IISER Aptitude Test covers that exam.
Two rules catch people out. You must apply on IISc's own portal; a high rank alone does not put you in the running. And you must update your JEE Advanced or IAT rank on the portal within three days of results being declared.
Who is eligible?
From the 2026 eligibility rules:
You must have passed, or be appearing in, Class 12 (or equivalent) in 2024, 2025 or 2026, from a COBSE-recognised board.
Physics, Chemistry and Mathematics must all be main subjects. Students who also took Biology or Computer Science are welcome, but all three of PCM are required.
You need a first class or at least 60% (or equivalent grade) in Class 12, relaxed to a pass for SC/ST candidates.
The percentage is worked out from aggregate marks in all subjects taken in Class 12, not just PCM. Only Class 12 marks count, even if your board combines Class 11 and 12.
Worked example: do you meet the 60% rule?
Sample numbers. A student's Class 12 marks, each out of 100: English 72, Physics 58, Chemistry 61, Mathematics 66, Computer Science 49.
Total = 72 + 58 + 61 + 66 + 49 = 306 out of 500.
Percentage = 306 ÷ 500 × 100 = 61.2%. This meets the 60% rule.
Now suppose the same student also took Physical Education and scored 40. IISc counts every subject, so:
Total = 306 + 40 = 346 out of 600.
Percentage = 346 ÷ 600 × 100 = 57.7% (to one decimal place). This no longer meets the rule for a general-category candidate.
Note that the PCM average alone, (58 + 61 + 66) ÷ 3 = 61.7%, would have given a misleading answer. Work it out from every subject on your marksheet, as IISc does.
What ranks got offers in 2026?
IISc publishes closing ranks on its cut-off page. For 2026-27, the General (GN) cut-offs were a JEE Advanced CRL rank of 2203 in round 1 and an IAT rank of 54 in round 2. Women's merit lists closed at 6560 (JEE Advanced) and 253 (IAT), because of the supernumerary seats. Category cut-offs are listed separately.
These are one year's figures for particular rounds. They change every year and should be read as a rough guide, not a target.
Which mistakes cost applicants a seat?
Not applying. The FAQ says only candidates who apply are considered, however high their rank.
Missing the rank update. Results must be entered on the portal within three days.
Miscounting the percentage. Use all subjects, as in the example.
Skipping counselling. In 2026 the counselling sessions were mandatory to confirm admission.
Missing PCM. A student without Mathematics in Class 12 is not eligible.
A preparation plan for Classes 11 and 12
Decide by early Class 12 whether you will take JEE Advanced, IAT or both. Sitting both puts you on two merit lists.
Keep your board percentage safe in every subject, not just PCM. A weak sixth subject can sink the aggregate.
Note IISc's application window and the result dates of your exams in one calendar.
For exam preparation, practise mixed problem sets across chapters each week rather than one chapter at a time. Our comparison of JEE Main and JEE Advanced explains how the papers differ.
When a JEE Advanced or IAT problem stalls you at the first step, the Fermi Problem Library has worked problems with a step-by-step solver that explains the reasoning rather than printing an answer.
This week, add up every subject on your latest marksheet and check it against the 60% rule.
