IISER Entrance Exam

No, it is not a compulsory section, but It is preferred if you attempt that section as well. As it will add to your scores. As most of the questions in aptitude exam are basic ones 10+1 and 10+2 biology NCERT books are more than enough. Thanks.

You will have to study biology to appear for IISER exam. Kindly refer to the link below:
https://www.shiksha.com/science/exams/iiser-entrance-exam

Of course, you can give IISER in 2019, but you should score well in your IISER Aptitude test as well as Boards. Also, check out Syllabus and Exam Pattern.

Please go though Cut off for ISC board. And even if you are not eligible for IISER you are still eligible for othrr exams like CUCET IIT-JEE etc. So All the best.

No, you are not eligible for IISER either. You must have got atleast 88.2% in your CBSE boards, but you still have one chance. Go for improvement exams and score well in them, and then you will be able to get admission in IISER.

There is specific cut off given for every board. I think, with this percentage you are eligible for IISER.

Yes, of course! 1st year B.Sc students can apply for IISER either through KVPY SX stream or through the SCB channel.

Yes, you are eligible for IISER. I have several students in my batch who are from PCB background. Of course, one always benefits of having studied PCMB till 12th. However, in our institute, in the 1st year, the students are encouraged to pick up courses from PCMB and EES as well. Hence, it would be good if one learns a little math or biology before coming to the institute in case you have not done it in 11th and 12th.

All subjects given in the syllabus is compulsory including Biology. This is the syllabus of the exam:
https://www.iiseradmission.in/?page_id=66