I have already used my 12 months Opt and now I would like to do Master's in Cs and apply for stem extension will that work? Please let me know
You need to discuss this with your school. You should not be eligible for OPT at all if you complete a same level degree.
I am afraid you might lose your STEM extension if you do not use it now. Completing another master's program will not grant you another OPT, therefore, you won't be able to use the STEM extension.
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