To start your preparation you can take help of NCERT books. So, that you can build your base strong. You can also make your time-table. So, that you can complete your syllabus on time and you get enough time for revision. Always choose a right study material for your study. Don't run after many books. You can take help of previous year papers to know the exam pattern and level of questions. Practice plays a very important role in scoring good marks and to increase your speed during exam. You should solve complete mock test series to analyze your preparation level at regular interval of time. It is very important to do complete analysis of your mock test series. So, that you can learn from your mistakes. Knowing your strength and weakness and regularly working on that is very important. Revision plays very important role make sure you give proper time to revision daily.

All the Best for your Preparation!!