hi,

see it can be possible. you may join nios or may appear as a private candidates from central board or state board. however you would have 1 year gap, cause the 10+2 course is 2 years duration and it you repeat 12th it would take 1 more year. however as per the iisc or iiser rules students of current year or the previous year 12th pass candidates are eligible to apply only.

but there is many good government and private institute in india where the syllabus and course curriculum is excellent and quite good as NISER or IISER. HOWEVER if you takes year drop you must study hard to achieve your success.

hope it would help.

Hello.
since as per the eligibility criteria for getting admission into IAS or IISER candidate must have studied physics chemistry and mathematics in his 10 + 2 and he must be cleared KVPY/ JEE mains or JEE advanced/ neet exam, since you have done your class 12th with PCB so if you're going to do your class 12th again with pcmb then it's fine after completion you would cross first eligibility criteria and then after you need to clear above mentioned exam.
Best of luck.

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