B.A LLB

Well, the only difference that bifurcates both these specialisation are the subjects that you study in the first 2 years of your course. Under BA you'll have specific subjects such as history, political science, sociology, etc. and in BBA you'll have subjects such as Accounts, Marketing management, Financial management, etc.

Hi!
The admission process differs in every institute. The common entry to B.A. LL.B goes through entrance exam. The entrance tests for this purpose are CLAT ISAT, and AILET. After the entrance, some institutes also conduct personal interviews for final selection.

Hi!
You can refer to this link to know the top law colleges. You can click on the individual college to know the admission process https://www.shiksha.com/law/ranking/top-law-colleges-in-india/56-2-0-0-0.

Yes, you can apply there and admission is based on the cut-off released by Allahabad University.

You need to have 50% in 12th with English as a mandatory subject. The candidate also needs to appear for IPU CET exam. For queries related to fee structure and placements, you can contact the college officials on the numbers provided in the link: http://www.ipu.ac.in/Contact_Us.php.

I'm assuming that you are talking about BA or for entrance exam of B.A. LL.B.
You just have to follow the current affairs for last 6 months before the B.A.You should read static GK in brief too. In English, your main focus should be on vocab and grammar portion, in maths, you have to prepare maths of up to 10th standard. In legal, you have to be prepared for legal reasoning as well as legal knowledge in brief.

No, Delhi University does not offer an integrated BA+LLB course.