Hi Varshita,
Hope you are doing well. The answer to your question is "NO" you cannot appear for GMAT with single sitting BBA. The eligibility criteria for GMAT exam requires a candidate to have a proper bachelor's degree from a recognized institution to apply for the exam, you need to follow 10+2+3 pattern in order to be eligible for writing this exam
Eligibility | Application | Exam Centre | Exam Pattern | Result | Preparation Tips | Dates
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile