how to study 10 hour a day with. full energy for 12th student pcm

Hello!

It seems like you are quite motivated and excited for your preperation.

But, the fact is, In order to clear entrance exam you are not supposed to do rigorous 10 hours of study.

Adapt Smart study techniques.

Instead of studing for 10 hrs.

First, start with clearing your concepts and go through all theory of chapter.

Prepare a dedicated set of 30 question of each chapter.

Those 30 questions should consists for all type of problem with varying difficulty level. (Ask for professors help for preparing set of 30 question).

Solve this 30 question again and again, until you get rid of this chapter.

After this, explore more  varietes of questions for this chapter.

It's not about studying 10 hrs., it's about studying 3 hrs. but daily.

i.e. Being Consistent.

All the best!

Hope this helps!