You have to have an idea of the chemistry of $\ce{Fe2O3}$ and $\ce{H2SO4}$ - there is no real way around it.
The former is Fe(III) oxide - basically, a typical metal oxide. Fe(III) is a little bit oxidising, but it's not going to oxidise $\ce{H2SO4}$ (it's incredibly hard to do so).
The latter is a strong acid. It might be a little oxidising if it is concentrated, but Fe(III) isn't going to get oxidised. It can act as a dehydrating agent if it is concentrated, but there's no water to be lost.
Chances are, there's not going to be any redox reaction. It's just going to be a simple acid-base reaction to form water and a salt ($\ce{Fe2(SO4)3}$). Notice how the oxidation state of iron does not change - that lets you work out the ratio of $\ce{Fe^3+}$ to $\ce{SO4^2-}$ in the salt.