Hi Aarthy,
Allen Coaching Institute is known to be one of the best coaching institutions of the country. To be honest, their faculties are good in major cities so you can expect good tutors at Chennai. Next and most importantly their study material is actually best in class. If you have solved everything there, you can crack NEET at one go. Being a product of Allen myself, I can honestly suggest you to join it if you're planning to score good in NEET 2020.
Thank you and all the best.

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