Colleges in Uttar Pradesh

Go and check all the fees of the courses provided by AU
Kindly visit the link
https://www.shiksha.com/university/allahabad-university-au-3574

Kindly predict your college in this college predictor. JEE Main rank predictor is an online tool which predicts the candidates rank range and probable colleges based on the difficulty level of the examination, average marks scored in JEE Main and seats available in IITs, NITs, GFTIs, and other SFTIs. The rank predicted might not be accurate but it certainly does give an idea to the aspirant. Know your college admission chances based on your JEE Main Rank, Home State, Caste, Gender, etc. Here https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Hope this helps.

Yes, you can get paramedical after class 12th with PCB. You can apply for admission. Good luck.

You cannot shift college, if you are in the same college then you are eligible for 2nd year.

Let me be frank, you percentage is very low and you will find it difficult to take admission in Galgotia for CS. But, for once talk to their admission cell.

For IPMAT, you must be very comfortable with NCERT Maths. It forms the basis for all the concepts which we learn and practice from other sources. Meanwhile, you can start reading News dailies, Magazines to strengthen your English grammar. Though I won't recommend any particular source, you can refer to content available on online stores. All the best.

You can get the sallybus pdf by given link:
https://www.shiksha.com/university/bhu-banaras-hindu-university/bhu-pet-exam-syllabus

Yes, BHU offers this course. You can apply for this course.

There is no negative marking, as per my knowledge.
Good luck.

No, you don't have to give the entrance exam as there are some local colleges providing admission without any entrance exam.