JEE

See, if have done 12th from UP then you will be considered as UP student in JEE Mains and you will be given home state quota in NIT Allahabad and more preference in UPSEE.

Kaka Deo is the best coaching center in Kanpur. Other than that, you have take tuition from different teachers as some teacher is special in different subjects.

I'll prefer you to take admission in any state government institute because if you ask your son for the improvement in boards, then there are might be chances that this will increase burden on your son that might result in loss of the previously gained marks also.

I'll prefer you to change your career field or if not then take admission in any private college and have good command on coding skills and on your subject.

At this rank, you might only get any college, as there are no chances of getting college at this score and rank, you can either drop an year or take admission in any private university and gain excellent coding skills that will only help you in gaining good job.

I would like to suggest Etoos in comparison with Toppr or Byju's. Etoos is better because it has good faculty members for online teaching such as Mc Sir, Nv Sir, etc.

Hello Uday, Kindly visit the link below:
https://www.shiksha.com/college/institute-of-engineering-and-management/exams/iemjee/question-papers.

Only CET or JEE exam.
There is no aptitude exam.

Please visit to the below link to get all your doubts cleared.
https://www.shiksha.com/university/academy-of-maritime-education-and-training-Chennai-2973/admission
All the best.