Hello Aspirant

For getting admission in Karnataka and Tamil Nadu you have to apply by All India Quota.And the last year cut off for AIQ in Karnataka was 530 and above but in Tamil Nadu you can get one college :Government Medical College,Tirunelveli,last year AIQ cut off-453 and the rest government medical colleges has cut off 540 and above.

You can check last year's  Neet cut off using this link:

Karnataka:

https://medicine.careers360.com/articles/neet-cutoff-karnataka

Tamil Nadu:

https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu

Also you can take the help of college predictor to predict your college :

https://medicine.careers360.com/neet-college-predictor

So I hope you find this helpful

Thank you

Good luck.