B.A LLB

Hello Raghunath,
These days there is an all India entrance test for admission to law colleges. You will have to appear and clear this exam.

Yes, it can be possible considering that the mapping of course done prior to transfer is accepted by ALC. Also, college needs to be verified for affiliation.

If you wanna pursue career in public services, BA L.LB is the best thing to do.

Law of Torts by RK Bangia or in case you are comfortable reading a slightly complicated book go for Law of Torts by Ratanlal and Dhirajlal, commonly called R&D.
2. Law of Contracts- A commentary by Polluck and Mullah is advisable or a viable option could be Law of Contracts by Avtar Singh
3. Criminal Law I - PSA Pillai
For Legal English, you no book is prescribed, go with the course module (if your college provides one).

In terms of age, NLU has withdrawn the age eligibility criteria for AILET 2017. You may have to wait for AILET 2018 admission notice to check eligibility. As per my understanding, you will be eligible to appear for AILET.