As long as your sevis is active/valid there should not be any problem. You can always use your any academic credits as university electives or non major requirements even if they don't suffice your major requirements. Normally semester lai bhachna laii kunaii karan chahincha. timile 3 semester nai padesakyou full time. total 24 credit per academic year hunu parcha sayad(not sure) status jogauna laii. so there should'nt be any problem. I suggest you to confirm with your ISO.
Hope this helps!
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