What you need to consider is that you need a further 11 UMS marks to change your grade. So you would need to find those 13 marks from the 3 exam papers. It doesn't matter where the marks come from, so you could get them from the bio paper because it's the total marks overall that count, not the grades for each paper, that you need to change. That said, re-marks are super tough this year so it's unlikely a re-mark would change your grade.