Hello Prashant

You may get a seat to BAMS course in government college if you qualify neet with a good score.

As you have mentioned you belong to OBC category  and you have got 142 marks  in pcb , you will be eligible for appearing Neet exam as minimum marks on pcb for obc candidate is 105 ( 35% )

Eligibility criteria for appearing Neet
For general category , the candidate must secure minimum 50% marks in physics, chemistry and biology ie 150 marks in pcb combination

For sc/st and OBC category,  the candidate must have passed class xii with 35% marks ( total 105 marks)  in pcb subjects.

You can also go through the link given below For reservation .

https://medicine.careers360.com/articles/neet-reservation-criteria