to study b.a.m.s in karnataka which colleges are better either government or private aided or private unaided?

You should prefer government colleges first as fee structure is less and you get better exposure and placements.
Below is the list of top government colleges you can check

1- BHU
2- Himachal Pradesh University, Shimla
3- Mahatma Gandhi University, Kottayam
4- Rajiv Gandhi University of Health Sciences, Bangalore
5- Maharashtra University of Health Sciences, Nashik

To check the complete list you can refer below link


Top Government BAMS Colleges

All the Best!!