A proper timetable/study plan must be followed to crack the examination. You have to figure out how much time and effort you have to put in on each topic. Concentrate more on your weaker sections.
Try to bifurcate your time equally among all subjects instead of focusing on a single subject. Prepare all subjects in a methodical manner.
Read NCERT books for clearing your basics. Solve mock tests, sample papers, and previous year papers on a daily basis. 80-90% of the questions come from the NCERT books.
Previous years’ toppers' answer sheets can be easily found on the Internet for all subjects by simply googling “best answer sheets”. It is important to know how to write to-the-point answers and do neat and clean work.
Solve previous year's papers. Although the questions may not be repeated, they will give you an idea about the exam, and about the type of questions that are frequented.
In order to finish things sooner, a high preference for superficial learning over conceptual learning is noticed in students, which is dangerous. It means you are not learning thoroughly and in-depth. Clear your basic concepts and read everything in detail.
Monitor your progress by taking regular mock tests. A mock test is a compass that tells you exactly what you need to focus on. It helps in your preparation, self-evaluation, time management, and understanding of your weaknesses.
Revising the topics which you have already studied, is a great way to prepare for an entrance exam. Whatever you study in a day, you should keep it revising within the time span of 2 or 3 days. Because doing so will only help you to remember the syllabus properly and you remain always connected with whatever you study.