You become eligible for CA CPT after passing class 12.
For preparation you should have thorough knowledge of syllabus of CPT exam.

Then you will have to prepare a proper study plan which you will follow.

Try to practice more and more previous year questions so that you can understand type of questions asked in exams.

Prepare each topic in a well manner.
All the best

When you will register for CA CPT you will get 4 text books with mock test and sample papers.

It is the best source for your study it is enough to score good marks.

If you want you can make your important time table according to your comfort. So, that you can easily complete your course and you get enough time for revision. 

Practice is the key to score good marks in your exam make sure you solve enough papers.

 

All the Best!!