UPCAT

Yes, you will but you are not eligible for JEE Mains.

Yes but your rank should be around 1000 for best gov B.Tech college.

AMU take admission through LEET but you can get admission in 1st year. You can take admission in HBTU-Kanpur, IET-Lucknow or MMU-Gorakhpur.

The last date to apply for UPTU B.Arch exam is over, it was 15th March. For more details, check the link below:
https://www.shiksha.com/b-tech/exams/upsee/dates?course=1249.

UPSEE exam is conducted for PG courses like MCA etc. !

In order to secure admissions through this entrance exam, candidates need to fulfill multiple eligibility criteria of UPSEE 2018, which are as listed below:
UPSEE Eligibility Criteria for B.Tech programmes
Candidates are eligible to apply for admissions into this course through UPSEE exam if they:
Have

Yes, it will help you because there are also some well reputed college under the universities which take admission on the basis of counseling. So, if you get a good score in UPSEE exam it will definitely help you to take admission easily.

Just go through the link for your further quieres
https://www.shiksha.com/b-tech/upsee-exam

COMEDK is better than UPSEE from COMEDK there are many private colleges under this exam but from UPSEE there are only 2 or three colleges are good. But the colleges of come k ate much better thanupsee.