Hi, the essentials required are an in-depth knowledge of the core science subjects- Physics, Chemistry and Biology. Other than that, you also need to pass in English Core in class 11th and 12th, so you need to be thoroughly prepared in this subject as well.

If you want to know something other than the preparation, well, you need to qualify in NEET, and get a min 50% in 12th board exams.

Here is the link for more details-

https://www.careers360.com/courses/bams-bachelor-of-ayurvedic-medicine-and-surgery

I hope I helped! If I left something unanswered, please don't hesistate to ask again!