If you wish to go for Engineering then you must have Physics, Chemistry and Mathematics as subjects in your 10+2. Now if you have Biology as one of the subjects then its ok but you must have PCM. Also you must pass this subjects with atleast 50% marks in order to be eligible for the course. Now there can be examination (entrances) which may have certain restrictions regarding the minimum board marks.

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I hope this answer helps. All the very best for your future endeavors!