my sc category rank in bplan is 650 I have filled all the available choice even then I don't get seat in mock allotment it means that I will not get any seat in josaa counseling. I have checked Nit Bhopal cutoff previous year it is enough for my rank even don't get any seat.

Dear student,

First of all congratulations the you have secured 650 rank in jee mains paper 2 from sc category.
Now as you didn't get any seat in mock allotment doesn't means that you will not get any seat in josaa main round counseling.

Basically, Mock seat allocation is held by josaa so that the students can get a rough idea of colleges that they might get in josaa main round counseling as per their filled choices of college in order of their preference. And the mock seat allocation is purely on approximate basis. It means that this is not 100% accurate. The final results may vary in josaa main round counselings.

As per your rank, till last round you can easily get planning course in School of Planning & Architecture, Bhopal. Because the last year cutoff closing rank was - 732 (for sc candidates).
And also you can get planning course in MANIT bhopal, as the last year cutoff closing rank was - 730 ( for male sc candidate) and 670 ( for female sc candidate).
But this above data is for 7th round josaa counselling. And this year josaa will be of 6 rounds, and last year in the 6th round counseling the cutoff closing rank for manit bhopal for planning was - 470.
So, this year till 6th round counseling, you have negligible chance to get manit bhopal, as well as school of architecture and planning bhopal.

So, there is a chance that you will not get planning course in School of Planning & Architecture, Bhopal and manit bhopal this year in josaa main round counseling till last round.