Hello Nikul,

To apply for State MBBS colleges, you need to have firstly appeared for NEET exam. Through NEET counseling you can apply to state MBBS colleges as well as to colleges all over the country (All India Quota seats) 

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

There are other exams as well, like state CETs or private university exams that you can appear for and through them you can apply for colleges/universities