Dear candidate,
Autonomous colleges are the private colleges which are not run by the state or it doesn't fall under the government; rather falls under its own jurisdictions. The fees are considerably way higher than the government medical colleges. The infrastructure and facilities however might be good or have state of the art equipments unlike in the government medical colleges but for government ones, you need to have a higher score in neet. It definitely takes a lot of merit to secure an admission in the public universities or colleges so definitely, it is the best and the deserving ones only claim it.
The fee structure is explained in a very good way in the links given below
https://medicine.careers360.com/colleges/list-of-private-medical-colleges-in-india
https://medicine.careers360.com/colleges/list-of-government-medical-colleges-in-india
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