Hi Dear,
Graduate Management Aptitude Test (GMAT) is conducted by Graduate Management Aptitude Council (GMAC) for admission into different management institutes. GMAC does not prescribe minimum qualification for appearing in the test. however, a student must atleast be a graduate to go for admission into b-schools. So, yes you can appear for GMAT exam if you have completed your Bcom.
For more information, visit the link below:
https://studyabroad.careers360.com/articles/gmat-eligibility#GMAT-Eligibility-Criteria-2021-Education-Qualifications
Good Luck
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