According to the new rule of reservation , the state from which you pass your 10+2 exam will be treated to be your domiciliary against which you will get the reservation of seat in colleges.

So as you mentioned that you have completed your 10+2 from MP then you will get the reservation at MP.

Previously the rule was that a candidate must be a domicile of the state in which he/she had been living for at least 10 years. But this rule got changed.

For more info , you should visit government of india for reservation of seat.

I hope my answer helps you. Good eve!