Hey !

Considering you are asking about NEET exam , then you  can apply in other state counselling but only under all india quota. If you have domicile of any state , then you can apply in the counselling of same state under state quota. But if you wannt admission in another state college , then you have to apply under all india  quota.

To know more about NEET coounselling , follow the given link :

https://medicine.careers360.com/articles/neet-counselling

Hope it helps!