Hello,

There is nothing like a special way to read all the subjects and be able to solve it in such a short period of time.

Do refer the prescribed books and study them more attentively. Practice numericals as much as you can. Don't try to grab all the concepts at a time. Go one by one. After you study one go to next and keep practicing questions of previous ones too.

The only key to crack is Practice. As you have less time you have to do smart practice. You have invest more of your time. If you are not able to understand ask doubts to teachers. Still you have doubt, you can ask to your friends, they will help you.

Hope it helps!