hello aspirant...

To calculate the rank for B.Arch:

100 - your total percentile score is the percentage  of people ahead of you. 112679 are the number of candidates appeared for January exam.

So rank formula is (100 - your total score) X 112679 /100.

for knowing the college of your eligibility follow the link given below. it is not possible for a general category student to get admission in nits with this percentile. study hard for the next session of jee mains. https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning

all the best..