You are medicine aspirant from Bihar after class 12 so you must appear in NEET UG exam and then participate in Bihar state medical counselling held by BCECE board, counselling gives seat for MBBS BDS AYUSH etc based on NEET rank and state quota

1, You must apply online on BCECE board portal after NEET result is declared

2, Fill application form with NEET score and choose colleges you want in Bihar or all India private medical seats

3, Counselling happens in rounds, seats allotted based on rank category and availability

4, For general category MBBS closing rank in govt colleges of Bihar is around 50000 NEET rank in last year

5, For OBC EWS SC ST reservation closing rank goes higher giving better chance

6, Fee for govt MBBS seat is low but private college fees high so choose carefully

7, After seat allotment you must pay fee and report to college with original documents

Important info and counselling schedule you can read here

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

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

How to predict rank and college based on marks is easy little bit steps only but need careful doings. You can use online tools which tell rank by inputting your marks, like if you get 150 marks in JEE Main then rank go around 40k to 50k depend on year difficult, first thing you do is check previous year trends to see how much marks gives how much rank, second thing use rank predictor from app where you enter your exam name, marks, category and it give approximate rank, after that use college predictor tool from same app which show list of college possible for your rank in your state or all India, that tools consider your category and quota also, so it accurate mostly. Also you can see closing rank from previous years for each college and branch, that also help you to estimate better. These tools give rough idea but actual allotment depend on cutoff and competition each year.

Check here rank predictor and college finder links from career 360 adbot below

How to predict rank and college based on marks is easy little bit steps only but need careful doings. You can use online tools which tell rank by inputting your marks, like if you get 150 marks in JEE Main then rank go around 40k to 50k depend on year difficult, first thing you do is check previous year trends to see how much marks gives how much rank, second thing use rank predictor from app where you enter your exam name, marks, category and it give approximate rank, after that use college predictor tool from same app which show list of college possible for your rank in your state or all India, that tools consider your category and quota also, so it accurate mostly. Also you can see closing rank from previous years for each college and branch, that also help you to estimate better. These tools give rough idea but actual allotment depend on cutoff and competition each year.

Check here rank predictor and college finder links from career 360 adbot below