No idea what board, what ums breakdown but if you got borderline A on the 60% unit(48/60) then you will need 32/40 on the other unit as 80 is usually an A. If you got 60/60 on the one unit you would need 20/40 on the other. It's more complicated than just grades and depends on the actual UMS marks. Good luck and try and get as high as you can regardless.