Below preparation tips would be helping you -

Read NCERT books thoroughly, and then refer some standard books.Try to understand the basics properly and then move to the depth of any topic.

Be thorough with the concepts as luck may not favour even though there is no negative marking. Also, try to solve as many mcqs as possible.

Do English and reasoning questions as well, as it will help increase the score.

There is no definite type or chapter of questions that will come for sure. Questions will be asked from anywhere in your 11 and 12 syllabus in all the three subjects.

Also try solving previous year papers. Although the questions may not be repeated, they will give you a plan about the exam.