Architecture

Hello Ranjitj,
You have scored very well in your JEE Mains paper 2 and your probable rank will be around 1500 and at this rank band you will get your desirable college. Here is the list of top colleges:
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/architecture-planning/colleges/b-arch-colleges-india&ved=2ahUKEwjfv-vW6oThAhUBY48KHavwDfgQFjADegQIAxAB&usg=AOvVaw1hqxnygDAkNsT1cIzsvaPF

Yes, you're eligible to get admission in Allana College of Architecture.

Admission is through counseling based on the rank obtained in NATA. JEE score will not be accepted.

The final AIR will be declared after April 2019 considering the best score out of the two JEE Main attempts for all the applicants, hence based on current percentile we cannot predict whether you will qualify for Kamla Raheja Vidyanidhi Institute or not. Wait for the final AIR declaration
Details:
https://www.shiksha.com/b-tech/articles/how-to-calculate-jee-main-rank-from-percentile-blogId-19953.

Dear, You have chance of getting NIT but try Shiksha college predictor tool for exactly which NIT colleges you may get https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Both the fields are totally different. It depends on your interest. If you are interested in planning and designing then you can go for architecture if not prefer engineering.

The course fees is INR 68,400.
Thanks

It is difficult to predict the marks as for now results only percentile score is released. If you want you can calculate the percentile rank. But no formula is there to predict the marks. Use this formula to predict the rank:
Rank Formula = (100 - your total score) X 145386 /100. Your rank may differ from the official cutoff and results which were released on the month of April by national testing agency NTA officially. You have to wait for the official results.

If you are general candidate, then no. Work harder, try to get at least 98.5 percentile to stand a decent chance to get into one of the NITs, IIEST or B.Plan in SPAs and MANIT.
You can try for different private and semi-private colleges. There are plenty of Architecture colleges apart from NITs and SPAs which are good in their own right.