Law

Dear,
You will find out your answer by following the given link.
https://www.shiksha.com/college/amp/i-m-nanavati-law-college-ellis-bridge-ahmedabad-26529

In the 5-year law program i.e., BA LL.B (Hons.) internship starts from the 1st year itself. After completion of the 1st year, internship starts. There are 5 compulsory internships in 5 years.

Osmania University will give you a wonderful chance. You will easily get through their eligibility criteria. There are other top colleges too. But Osmania is the best for an overall legal career development.

Dear,
You can expect colleges like KV Rangareddy Institute of Law Hyderabad, Mahatma Gandhi Law College, Hyderabad, Pendakanti Law College, etc. But I shall still recommend you to attend counselling of top colleges.

Clat Possible is doing a great job there.

Not important, but National Law Universities which you get through CLAT are like IITs of law. They provide an overall better experience than any other law college.

No, CLAT is an exam for National law university entrance.

You can do a three-year law course.

It is not out yet.

Most of the colleges take candidates who have 1000 rank or less without their college's admission test. Since you have above 1000 rank, you may have to give admissions test again for a particular college. I would also suggest you to call the respective college and ask about admission details.
Best of luck.