Kota

In my opinion resonance is best for IIT preparation for freshers as well as repeaters. Best of luck.

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Engineering mathematics by N. P. Bali and A. J. George
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In my opinion resonance is best for IIT preparation for freshers as well as repeaters.

The school studies are important as that are the basics of the course but you can't crack JEE Advanced with its help. You should prepare for IIT to crack that.

If you are interested, then you can otherwise don't waste your time and money there. Best of luck.

Kotak is the best in term of IIT preparation. If you spending money then Kotak is the best option as it has a better atmosphere for study and competition.

Congratulations for good marks. For better answer I have to know your category. You can check it on the college predictor in siksha app.

For JEE Mains preparation, I suggest you Resonance.

Resonance is best for IIT preparation.

Go for NIT because they provide more facility in term of campus placements and other activities.