Hello,


It's sad that you have wasted 1 year but you still have one year left for preparation of BITSAT and one year is pretty much enough for preparation if you will prepare well with the right guidance.
Focus on important topics while preparing for BITSAT follow proper books and previous year question papers to get an idea of the pattern.
BITSAT is not very tough exam but it requires accuracy and speed so you will have to put a lot of efforts in solving more and more questions to increase your speed and accuracy.
You can checkout the link below for best books for bistsat preparation.
As you have also asked about other exams for admission in computer science engineering then there are some other entrance exams like Comedk, Wbjee,KCET,MHTCET,SRMJEE etc. You can crack any exam with hardwork and determination.
Best books for BITSAT :

Physics

• Concepts of Physics by H.C. Verma Vol 1 and Vol 2

• Problems in General Physics by I.E. Irodov

• Arihant Physics by D. C. Pandey

• Advanced level Physics by Nelson and Parker

• Fundamentals of Physics Resnick, Halliday, Walker

Chemistry

• Atkins' Physical Chemistry

• Physical Chemistry by N Awasthi

• Organic Chemistry by Paula Bruice Yurkanis

• Organic Chemistry by M.S. Chauhan

• Inorganic Chemistry by J.D.Lee

• Inorganic Chemistry by O.P.Tandon

Mathematics

• Higher Algebra by Hall Knight Bernard-child

• Differential Calculus by Arihant

• Integral Calculus by Arihant

• Problems in Calculus of One Variable Algebra by I.A.Maron

• Class XI & XII by R.D. Sharma

English Proficiency and Logical Reasoning

• BITSAT English Proficiency & Logical Reasoning by Disha Experts

• The Pearson Complete Guide to the BITSAT (English) by One Learn Education

• Wren and Martin

https://www.google.com/amp/s/engineering.careers360.com/articles/bitsat-preparation-tips/amp

I hope this helps.

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