It’s at the discretion of the REC. I personally took 4 in one day, but you need to have at least 3.5 hours left in order to start a new one. I’ve heard of people doing more, but it’s not recommended. I’d rather just take my time and make sure I didn’t make any mistakes. You’ll be kicking yourself if you fail an exam by one question because you were in such a rush to finish and get to the next module.
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