Teaching & Education Entrance Exam

The important points to be followed for preparation of mathematical sciences are:
For part A, practice some good books of General Aptitude.
For part B, a practice of your subject is must since you have MSQ (multiple select questions) in which multiple options can be correct.
For part C, again, the subject knowledge is a must. This part also contains MSQ type of questions.
For detailed preparation tips, here are some points:
Make a plan about the studies and follow some good books. Prepare short notes and handbook for formulae & concepts which can be helpful at the time of revision. Be selective with the questions in the exam as there is negative marking in both part A & B. Try to give mocks which will be very useful for your introspection and give you an idea about how to attempt the questions in the exam.
Hope this helps!

As stated by the CBSE:
Candidates who have secured at least 55% marks (without rounding off) in Masters Degree or equivalent examination from universities/institutions recognised by UGC (on the website: https://www.ugc.ac.in/oldpdf/consolidatedlistofalluniversities.Pdf) in humanities (including languages) and social science, computer science and applications, electronic sciencE, etc. (list of subjects of post-graduation attached at page No. 20) are eligible for this test.
The Other Backward Classes (OBC) belonging to non-creamy layer/scheduled caste (SC)/Scheduled Tribe (ST)/ persons with disability (PwD) category candidates who have secured at least 50% marks (without rounding off) in Masters degree or equivalent examination are eligible for this Test.