Yes, you are eligible to appear for BITSAT if you meet the overall eligibility criteria. According to BITSAT rules, candidates must have passed the 12th board exam with at least 60% in Physics, Chemistry, and Mathematics (taken together), and at least 75% in the qualifying exam overall. Since your combined percentage of 2A and 2B is more than 60%, and if you meet other conditions like having the required subjects, you should be eligible to apply for BITSAT.

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