If my state category NT-B rank is737 in mhtcet and not good state general merit is 40,000 so which rank is seen in 2019 to get mech in spce
It doesn't matter whether your state Merit is considered or your category rank is considered for admissions, as in both cases the students who will be behind your rank in one of the ranking types will always be behind you in any of the rankings given that your competition is only with the candidates of your category.
For that matter, if you look for the cutoffs, they are provided with the state general merit no. for every category.
All the Best!!