Hi there, greetings of the day!

Preparing for examination requires proper planning and regular preparation from the strategic because completing course in last moment might not give you proper results.

Help or side books are important as it covers various topics from that questions may arise very frequently. Talking about best guide rather than Nanuet u would suggest you try Target publication books as they will be very helpful. Apaprt from this textbook and NCERT are very best for every exam. So donot forget to prepare from them if you still have time.

I hope this information helps you.

Thank you and good luck:)