B.Arch

Yes, there is a provision for lateral entry. You can appear for LEET examination or take admission in the second year on the basis of your percentage of Diploma.

The procedure of normalization of NATA-2016 score will be put on NATA web site in due course of time. An attempt will be made to normalise (with respect to NATA-2017) the score of NATA-2016 qualified candidates seeking admission in the session 2017-18 in order to specify their position in order of merit for counseling purposes. Such guidelines would be based on statistical analysis and the Councils decision would be final in this regard.

Please specify the college. You are looking for as cut-off varies from college to college and also for which exam you have appeared in.

Check through the predictor below :
https://www.shiksha.com/b-tech/resources/mhcet-college-predictor

That will be too late and if you don't get any good college in that then it will be problematic for you. If you are getting any decent college now, take it.

Hi,
Check the admission process here:
https://www.shiksha.com/architecture-planning/course/b-arch-indian-institute-of-engineering-science-and-technology-howrah-57630