Hi grubbygoo

I'm just a student but I'll try and help, although it's a big subject unless you can narrow it down to what exactly you find difficult.
1. Do you understand how the order of flats and sharps are built up through the
Circle of Fifths? If you understand the Circle of Fifths, it should be easier to remember the key signatures. If you don't understand the Circle of Fifths, I'm sure lots of people on here would be able to help with that.
2. Do you have a
scales book which shows you the finger patterns?
If you know which scales have sharps or flats, and you know which finger to start on, then it's matter of taking it very slowly at first, thinking all the time about where an accidental falls and which finger to use.
But if you could tell us a bit more about what you find particularly difficult, it would be easier to help. For instance, can you play hands separately but find it difficult putting hands together? Can you play one octave but find it difficult playing two octaves? And so on - there are so many things which people have problems with, and it's difficult giving the right help without knowing more.
Do you have a teacher by the way? And when is your exam?
Sorry not to be more helpful...