Diploma

Eligibility criteria to seek admission in Ph.D degree in mathematics is minimum. B.Tech candidates from any engineering discipline are also eligible to seek admission in Ph.D.
You are not eligible for seeking admission in Ph.D in mathematics with B.Com or M.Com degrees. PG Diploma is not to M.Sc mathematics, therefore, after PG Diploma in mathematics, you will not be eligible for seeking admission in Ph.D.

Hi,
If want to apply for govt. colleges then you have to apply for CET ( central entrance test) in this after selection you are required min. 35% aggregate in physics, chemistry and maths.

It depends on your interest. Also, have a look at the future scope of that particular course.
Good luck.

If you want to do government jobs then start preparing for those exams and take arts stream.

Your Diploma doesn't matter for JEE exam, if you qualify JEE Mains then you have to study from first year your diploma will not consider for JEE, but you got the benefit of OBC certificate.

Hello Vassu,
It's always better to take a break, study hard and clear all the backlogs. With this, you start with a clean slate in next semester to enable study if only limited subjects. I would strongly advise you to opt for this strategy.