Vellore

You can take VIT Vellore but if you want to study at lower cost in a government college then you should choose Trichy.

NEET is the recent and a must requirement followed by general aptitude exam then interview. CMCVEE is no more.

No, they will only take admission through NEET, no other examination will be held. Previously, they use to conduct their own entrance exams, like JIPMER and AIIMS, but now only possible way to get admission is through NEET. Hope it helps.

Yes, they conduct a separate test.

Check out cutoffs from various sources or contact Arch students of the college.

B.Tech at IIST is quite reputed but doesn't assure you any job.

Take B.Des only if you really interested in Design.

It is not possible to quantify your chances of selection, but I can assure you that you can get at least BDS seat at this rank. Besides, remember that you have more chances of you apply for private colleges as well.

I don't think they have categorized the hostels based on seniority.
Refer to the URL below, you will get the complete idea about hostel blocks and rooms available there.
A-4AC, 4NAC, 2NAC and 6NAC
B-3AC and 3NAC
C-2NAC and 4NAC
D-1AC and 1NAC
D Annex-3AC, 3NAC, 4AC, 4NAC
E-2AC and 2NAC
F-2AC, 2NAC, 6AC, 6NAC
G-1AC, 1NAC, 4AC, 4NAC
H and J-1AC, 1NAC and 3NAC, 6NAC (new)
K-4AC, 4NAC, 6AC and 6NAC