CBSE 10th

Yes, as it is a private university, so your aggregate should be 55 percent.

Welingkar accepts CMAT 80 percentile and above scores.

MAT score is Not considered in Welingkar.

If you are general student, then aim for at least 99% in CAT exam. 50% in graduation is required to be eligible and it will only be asked about in interviews.

As there is a huge gap now between your academic qualification, getting in a regular course will be a challenge. I would recommend you to join NIOS for your 11th and 12th.

Yes, you have a fair chance of getting a GD-PI call. There are a lot of students every year who perform well in GD-PI and convert despite their low score in entrance exams.
Good Luck

You are eligible to apply for MBA Anna course if you don't have any history of arrears. Your marks are fine. If you have any work experience, you can apply for PGDM, which is considered to be the flagship course of PSGIM.

Most probable yes, you have to produce all the relevant evidences during the counseling process and also write as well as contact to NCHMCT regarding the mistakes occurred immediately.

Yes, you are eligible. The minimum marks requires in class 10th for Diploma engineering programmes is 35% in aggregate. Further, the admission are done through the common admission process (CAP) conducted by DTE Maharashtra. Hence, participate in CAP round for admission.