st pauls girls entry

hey guys, im currently in yr 9 in another school. previously this yr, i sent an email to the admissions team at st pauls girls school for available positions, which they did not have any of. but just yesterday, they sent me an email saying that they have a place available and that i should come for an exam day on 27th june- so i have rlly no time to revise.
i think this is a rlly rare case as im assuming they dont have many cases where they offer places in yr 10 entry, just after 13+.
they say that i must take maths, english and a mfl, but i have to take two as im doing two for gcses.
then i'll have interview with a senior staff and also one with the head of science (so im guessing that science is not written test but speaking form).
other than that, i didnt get offered much info so i rlly dont know where to start studying and i also have no clue about the difficulties, layout, and the standards
so if anyone is in spgs right now and is near my age, please please please give a reply and help me out
thanks sm!!!