You should start your preparation with NCERT books to clear your basics and to build your fundamentals strong . Syllabus is based on your NCERT books. So, your first priority should be to complete NCERT books.

You can recommended below books for your preparation

Physics- You can refer H.C Verma or D C Pandey

Chemistry - You can refer O.P Tandon or J.D. Lee

Mathematics - RD sharma is best book after NCERT.

Make sure you also solve complete mock test series for your preparation for your practice and to know your strength and weakness. So, you can work upon them.

All the Best for your Preparation!!