I am in 2nd puc right now and I am preparing for kcet 2021. Can I use the arihant bitsat book for kcet preparation also? I will also do previous kcet papers but can I practice from arihant bisat book for kcet preparation.

The syllabus of KCET and BITSAT and all other engineering entrance examination are almost same because the exams are conducted on the basis of syllabus of Class 11 and 12. So you can surely prepare from Arihant's BITSAT book. But you must also follow NCERT Textbooks of class 11 and 12 as these books are recommended by experts for having a clear concept over all the topics. Sometimes questions are directly asked from NCERTs. So its better not to avoid NCERT. One of the best study materials for KCET is 16 Year's Solved Papers Karnataka CET Engineering Entrance by Arihant Publications. Once done with the textbooks you can move on to solving last years' exam appears. Also give mock tests regularly to boost your preparation. Then find out your weak areas and work on them.