UPCAT

Yes, it will give all India rank as they give rank according to your marks that you scored in exam among all the aspirants appeared in that exam.
If you belongs to any category in UPSEE, then they give ranking according to your category also.
Regards.

I think there is a need for counselling. UPSC is one of the toughest exams to crack and this will require strategy to implement and follow. So, you should better refer a counselor, a reputed teacher and an expert in the field. He will surely guide you.

I think you should go for GBTIs as UPTU has got no good college as compared to JEE (for B.Arch).

Check out the predictor below for details:
https://www.shiksha.com/upsee-college-predictor

It is a general term to say "you don't have to pay the tuition fee". e.g in the US, the waiver may be because you have good scores in lets say SAT, GRE, GMAT, etc. when you are enrolling to undergraduate or graduate programmes. Tuition waiver sometimes is also referred to financial aid. An aspirant whose family background is not so strong or whose parents income in not more than 1 lakh, can get the fee waiver.

Admissions for the MBA program at IIT Kanpur are done via CAT scores and subsequent interviews. The admissions for the year 2017 has already ceased and the new batch is set to begin in July.

No, you need to pay it only once and with this, you can participate in all the 5 rounds.