Hello,

The eligibility for engineering candidates are 1) they must have scored at least 60% in class 12. 2) Candidates must have completed their 12th in science stream with maths, physics and chemistry as a part of their subjects.

You do not need to reappear for all the exams. You can appear only for the subjects that are main in the eligibility for engineering. The main subjects are Physics, Chemistry and Maths.  You can appear for these examinations only and also if you are sure that these subjects plus the other subjects included will give you a percentage of more than 60% then you don't have to give any other exam.

I hope this helps,

All the best