You will be eligible for GRE but you may not meet the individual university admission criteria due to your 12th situation.

The best thing to do is drop a mail to the admissions coordinator of the university of preference. They will generally reply within 1-2 days regarding your issue. 

Hi Akanksha,

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GRE 2018 has no eligibility criteria. From which university have you done your undergraduate program from? I dont think that should be a problem.

I suggest you write to the admission counsellor of the university you are interested to pursue your higher studies in to clear this issue.

Do revert.

Best wishes,

Dear,

the chances are less to get with this 12 issue but i thing there are some colleges are ther even you can contact to them and tell this issuw i hope this will help you out.

ALL THE BEST.