Please tell me books which are sufficient for cracking bitsat as there are only 5.5 months left.

If you are preparing for JEE Mains / Advanced , BITSAT does not require a much special attention. The questions asked in BITSAT check your concepts , these are not in depth ( because of time constraints ). So to prepare for BITSAT you need to focus on your basic concepts. In case you specially want to refer to a book , just for the sake of practise you can go with Arihant . But again I tell you if you keep your basics very clear BITSAT will be easy for you. AS far as English and Logical reasoning is concerned , you can look out for some synonyms and antonyms for English and Logical depends on your skills. If you need anything else I can surely help you. Aishit Jain, BITS Pilani , Pilani Campus.

BITSAT is damn' easy. (Aman Kansal scored 450/450 XD)

You just require the basic concepts, thats it. Apart from this you don't need any book particularly for it.

Since the exam has PCM along with English and Aptitude, the standard of questions is quite low.

But the main challenge or the crux is managing the time and completing the paper with 100% accuracy within 3 hours, since you have to deal with English and Aptitude as well.

So just go through the last years' papers and you'll get a rough idea of the exam. Do try to focus on English and vocabulary and Aptitude.

If at all you require books, you may go for BITSAT Question bank and others.

All the Best!