JEE

Yes, the minimum cutoff for AAT will be around 100 marks, hence you tend to be eligible for the examination.

Some suggestions be:
1- A Complete Self Study Guide for B.Arch. Entrance Examination by P K Mishra
2- Steps to Architecture NATA B.Arch. Entrance Exam Paper Guide Paperback by Nimish Madan
3- Steps to Architecture: B.Arch. (NATA/JEE Main) Exam Guide Paperback by Nimish Madan
4- NATA and B.Arch. Complete Self Study Material by Ar. Shadan Usmani

Yes, you can get into B.Arch with these marks into DY Patil School of Architecture.
Since, the cutoffs are dynamic and this data is based on 2016, so it may change and things may not turn in your favour. Although, your admission is more in your favour.

Yes, Vidyalankar Institute of Technology accepts JEE marks. You can show it for admissions.

Kindly mention the college in which you want to get into through these marks.

You are likely to get the best colleges in India with such a big rank. I would suggest NIT Trichy, NIT Kozhikode, BMS College of Engineering, College of Architecture, Chandigarh and RV College of Engineering.
Note: Kindly check the least board marks for colleges as mostly for general, these marks are 75% in 12th.

Sorry, but it is number one college in India with very limited seats in architecture and planning. Kindly prefer other options for it.

Since you have done the field related to medical and too engineering too. Though, I would suggest you to take the decision on your privacy, comforts and taking your ambitions on scale. Medical is practically a costly field and a hard work to put into more theoretical knowledge for long and then into practical practise. Whereas engineering is cheaper and more practical application based. Take guidance from your peer and the ones who teach you or preferably your parents. Scope wise, both are best.

Yes, you have good chances of getting government colleges. There are many government colleges in which you can get admission because your rank is good.