B.Arch

Yes, the admission process will start once all of the exams are over.

Yes, you can easily get admission in this college with this score. But, you should try for the other good colleges like other private colleges as your score is quite good.

Eligibility criteria for admission in B.Arch:
Minimum 50% required in class 12th with Mathematics as a mandatory subject.
Admission is based on the marks obtained in 10+2 and NATA score.

The result and criteria sheets is not out yet. It depends on that totally.

The Architecture Department is a seperate college of MAHE. Even if it's in MIT campus, it has nothing to do with MIT.
Coming to the curriculum, the the course is totally dependent on faculties here, assignments are taken properly, excellent infrastructure, etc. Regular guest lectures are also arranged for the students.
Hostels are common for both MIT and FOA (Faculty of Architecture). Also they can be a part of various clubs of MIT and MAHE. Numerous technical and cultural clubs are there to make life at Manipal interesting.
Hope I have answered your question. Feel free to ask if you still have doubts.

Students willing to take admission to B.Arch. have to appear for Online test conducted by Council of Architecture (NATA).
https://www.kletech.ac.in/admission-ug/

Go through the link below for details :
https://www.shiksha.com/b-tech/upsee-exam?course=1249.

Yes, you can easily get admission in this college with this score. But, you should try for the other good college like SPA Ahmedabad, NID and other private colleges as your score is quite good.

No, these two universities are very different from each other and hence there is no single form for the same you have to apply to both universities separately.

There are very tough chances for you to get this college.