Hello,
As you've already qualified NET, so you can teach at university level and in case you're interested you can also pursue your higher studies, in fact this will offer you greater opportunities and comparatively the pay package will also be very good, and as per the eligibility criteria for PGT Biology in KVS, candidates need to pass any of the following subjects in their post-graduation level;
In case, you still want to do Master's Degree you have to do in any of the subjects mentioned above, and NIOS is meant only for secondary and higher secondary education, it doesn't offer graduation and post-graduation courses.
Pursue M.Sc. in Data Science from Manipal Online.
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