It is a AS level question and what I don't get is that I don't have a reduction reaction for the reaction to work no matter what I do.
MnO- 4 + H2SO4 ------------------ Mn+2 + SO-2 4
If you can get what I am saying

Don't you have the data sheet where there are a lot of redox reactions mentioned and listed according to their EV values?

Anyway, you lack the water molecules here.

MnO_4\ ^- \ +\ 8H^+\ +\ 5e^-\ \rightarrow\ Mn^{2+}\ +\ 4H_2O

You can add the SO4^2- ions if you want, but this is the ionic equation for this redox reaction of MnO4