Preparation for BITSAT must start in the early stage, early stage start from class XI .one can also start from class VIII by building his/her concept in some of the common subject like English, Mathematics and SCIENCE .one must make a habit of reading Newspaper and collecting Reasoning question, From class VIII .this activity always help in the preparation of BITSAT.   Now for a student who is in class XI have to take this start very seriously and with proper planning to move forward. In the planning part one have a better understanding of the pattern of exam and the subjects .for different paper  different planning is require for example For English and Logical Reasoning: Read "The Hindu" Newspaper,  Magazine: Chronicle / CSR /India today. Reasoning book for example: Reasoning Year Book / Upkar reasoning book : Example TMH book-- Selective study.

Now come to subject which play a very important role in the written test for  Maths: read all books related to IIT / AIEEE and do lots of problem as you can  Good command over maths is always an advantage. As in BITS from maths 45 questions are asked. For Physics: read all books related to IIT / AIEEE mainly follow H.C.Verma both volume.  Chemistry: read all books related to IIT / AIEEE  and refer three different books for physical, organic and inorganic sections .for physical read P.bahadur and for organic chemistry read I.L.Final volume-I and for inorganic read J.D.Lee .for English: For Vocabulary: Word Power made Easy by Norman Lewis ,English Grammar: Any standard book. Read standard books and magazines. The most important step before start is to go through BITSAT Previous year papers .Read thoroughly and vigorously for the last 2-3 months as most probably you would not be having any exam in those two months. And at last never left your NCERT books .