IISER Entrance Exam

Yes, maths forms an important component of IISER entrance exam and it is not optional.

Please check for your eligibility to pursue IISER Entrance Exam from the criteria mentioned at the link provided below:
https://www.shiksha.com/science/exams/iiser-entrance-exam.

Indian Institutes of Science Education and Research (IISERs) conduct an entrance exam in order to provide admission to candidates in five-year long BS-MS dual degree programme offered by them. Candidates who have cleared their Class XII in Science stream are eligible to apply for IISER Entrance Exam 2018.

Yes, you are eligible.

You are eligible for most of the states.

Yes, you may give the test as it has 4 subjects - Physics, Chemistry, Biology and Maths. Leave out maths and prepare fully for the three subjects as very fewer students out there have PCMB.
Best of luck.

IISER Aptitude Test is not that high of JEE Advanced, but is not easy, nevertheless. However, if you have been preparing for JEE Advanced the aptitude test will be an easier nut to crack.

Hi Sarla,
IISER conducts its own aptitude oriented test. There will be questions from Physics, Chemistry, Maths and Biology. It is a must to attempt questions from all these areas. All questions will be objective in nature. There will be 15 questions in each of these sections. So it is necessary to study biology. You can really do good in PCM Questions + Study NCERT Level Biology.
Thanks.

Study the NCERT syllabus thoroughly. Then, practice as many questions based on previous years.