Hi,
According to the eligibility criteria for GAT-B for MSc, you must have completed your graduation i.e 10+2+3 from a recognized university with a minimum of 55% aggregate.
You can refer to this link for complete information regarding GAT-B including important dates, syllabus, eligibility criteria etc: https://university.careers360.com/exams/gat-b
I hope this helped you.
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