hello,

The basic difference between tier 2 and tier 3 colleges are

• Tier 2 colleges have the accreditation rating from A and B and B+ with the facility of the colleges and universities to help the students accordingly in placements and reputable ranges
• Tier 3 colleges are the one that help the students build a future in a way in shaping them to motivate them in the colleges and universities.

Government colleges with affordable fees are :

• AIIMS, Delhi
• MAMC, Delhi
• JIPMER
• Bangalore medical college and research institute
• Lokmanya tilak municipal medical college, mumbai
• King's george medical college

https://medicine.careers360.com/colleges/list-of-government-medical-colleges-in-india

you can refer to this link for more information

hope this helps!!