Colleges in Rajasthan

For distance education, you can try in IGNOU or Vardhaman Mahaveer Open University.

Here is some helpful information for you:
https://www.shiksha.com/university/the-lnm-institute-of-information-technology-jaipur-25194/courses

It depends on your options, LNMIIT as a college is a good college but mechanical as a branch was introduced very recently, although it is growing at a rapid rate. We have established societies for mechanical students like ASME and LNMIIT was also the host for recent ASME E-fest Asia Pacific. Placement-wise the statistics aren't available but it was not good this year only 5-10 student selected for core branch.
If although you have some other options where the branch is more established then you should go for them.

Hi,
Eligibility: Students with B.Ed./B.T. or L.T. from Banasthali University or a University recognized by Banasthali as equivalent thereto with at least 55% marks. (50% marks in case of SC/ST candidates) Admission is based on Merit.
For details information of admission of Banasthali Vidyapeeth, you can see below link:
Hope this will help you.
Thanks.

Eligibility & Admission Procedure:
Minimum Eligibility:
Passed in 10th Exam.
ADMISSION PROCEDURE
Pre Test conducted by BTER Jodhpur. Direct Admission on merit basis.
Well, there is no stringent age rule for polytechnic but still, you need to check with the college for age eligibility.

It depends on marks that you obtain in Diploma. If you have more then 95% marks, only then you may get admission. Direct in second year admission for Diploma student.
Best of luck.

Your 12th marks is very less than required marks. So, I don't think there is any chance of getting admission on basis of this marks. Good luck.

Shridhar like universities are black spot on Indian education system. If you want just a worthless degree, then go for it. Good luck.