Hello P Suman, Last year around 1,45,386 students gave JEE Main paper 2 which is B.Arch paper, and this year 1,38,410 students registered for JEE Main January paper 2 and 1,12,679 student gave the exam,bit this number will increase up to 1.5 lakh in JEE Main April.
so, if you go 88 percentile in JEE Main paper 2 then your rank will be around 16 to 19 thousand after JEE Main April paper.
Here i am writing the closing Cutoff rank for B.arch for some NIT's for All India Quota General category

MNIT Jaipur - 3004

NIT Patna - 6860

NIT Trichy - 1176

NIT Hamirpur - 4361

NIT Nagpur - 3250

so there is very less chance that you will get a NIT but if through Home state quota it will be quite easy for you and if you belong to any category like OBC, SC, ST then your chance of getting NIT will increase very high.
There are many other colleges other than NIT's which offers admission through JEE Main for B.arch you can apply there also.

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