• Follow a routine, that is fix amount of time you will spend on studies.
• Give equal importance to all three of Maths, Physics and Chemistry.
• Chemistry appears boring and mugging things more, but it gives you more marks in less time.
• Try to read NCERT books especially in Chemistry. (I know you will find it boring, but take care, you will miss some good things if you dont read it carefully.)
• Make a separate notebook for remembering formulas in each three of subjects.
• Never give up on yourself and always try to learn andunderstand concepts.
• Learn the very basics of concepts and use it to solve the hardest of the questions.
• Draw a lot of free body diagrams.
• Speed up your calculations and accuracy.
• Avoid silly mistakes of units, wrong bubbling and not reading questions carefully.
• Keep revising formulas and concepts on regular interval.
• Never leave doubts and keep clearing them.
• Never postpone your planned targets.
• Reach to your teachers regularly and share your problems .
• Also keep your parents aware of your issues/problems.

To crack any engineering entrance exam, one needs to have a strong hold over the concepts and they should be crystal clear. The teaching of all major engineering related concepts begin in 11th standard, therefore it is important to buckle up right from 11th standard so that you can gauge the pressure and quantity of syllabus and proceed accordingly.

Coaching acts as a catalyst to your preparation and keeps guiding you at every stage but you can go ahead even without coaching with determination, right time management and right books.

You can buy books of notable authors in this domain like HC Verma, DC Pandey, Solomon and Fryhle etc and begin with your preparation. Managing time is the most crucial aspect, devote most of your time to study but also take out some for unwinding, spend time with parents, talk about leisure stuff and then go back to study. Also remember to take proper sleep of 6-7 hours.

Follow the above mentioned points diligently and you are sure to crack any Engineering Entrance exam.

Please let me know if you want me to elaborate on the books.