Help a fellow 10th grader

Kindly help

I am currently in class 10, my boards will be over till 18 mar.

I want to start my preparation for clat early as I have seen that 12th board will be tough & exam of clat will be prior to boards, so I want to clear my concepts as soon as possible so there will be no burden in last.

Kindly provide me some advice to manage my time with 11th ass well as clat

And suggest some good books/teachers as well (will not be joining any sort of coaching)