I am studying 12th standard in Tamil Nadu. Are there any tips that you might give me for the best NEET coaching?

For NEET UG, Akash and Allen Institutes are the best coaching institutes. Their study materials are good. You can also take subject-wise classes and self-study. Whether you are opting for coaching or doing self-study, most of the studying you will have to do on your own. Read NCERT books, these cover all topics. Solve as many MCQs as you can, so that you develop a good attitude.

One of my friends joined MBBS in Tamil Nadu through AIPMT. There were only 15 seats in every batch filled by the exam while the remaining were reserved for the residents of Tamil Nadu offered on the basis of their 12th marks. 

My friend did not join any coaching instead he took subject-wise classes and studied the rest on his own. Coachings help you with proper guidance and provide study materials as well. But in the end, it all boils down to your own preparation. As for NEET-UG, Akash Institute and Allen Institute are considered the best.

Try solving as many MCQs as you can. Even if you are well versed with the topic, solving MCQs is a must. The more you solve MCQs, the more you will learn about time management during exams. Also, go through NCERT for all the basics.