Considering the limited time you have. Try Arihant Sample Papers/ Previous Year Questions. At least try one paper daily and analyze it. See the relevant topics from NCERT for clearing your concepts in weak areas. This will help you increase your rank/marks by many folds. All the best!
Here is the complete list of best BITSAT preparation books:
Comprehensive Coverage of NCERT Syllabus for Classes 11 and 12 (English) 4th Edition – Arihant Publication
BITSAT Explorer 2018 (With CD) (English) by MTG Editorial Board
BITSAT English Proficiency & Logical Reasoning PB (English)
The Pearson Complete Guide to the BITSAT (English) by One Learn Education
Comprehensive Guide to BITSAT Online Test – with Mosk Test CD (English) by Disha Experts
13 Practice Papers BITSAT 2016 PB 8th Edition by G K P
Good Luck
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