Congrats if you are scoring 600!!
I’ll tell you NEET 2017 stats
You can get a good college via all India quota as well but maybe in some other state. If you are comfortable with relocating then you can go for that option.
But people get better colleges in state through state quota. For instance one of my acquaintance had around 606 and she got the best college in maharashtra(GSMC) through state quota.
Wishing you all the best…