This happened to me a few times already. For instance I know the right answer is A but on the paper I put down B or C subconsciously. When I check the answers I know I picked the right answer for this question but on the answer sheet I had the wrong answer on it. Now, what is wrong with my brain and anyone had the same experience? This is an egregious mistake that can be very costly.
I had the same experience some times, slopy mistakes. For the real exam I will mark the correct answer with a circle in the book. I will make time to conciliate the book with the answer sheet.
Yeah circle the answer in the book, and then fill in the bubble. If you still have time in the end, go back and reconcile. If you don’t, you will probably still fine because you already double check by both circling and filling the bubble.