You need to know the basics of:
Geometry stuff like Gradient and Midpoint, how to read them
Trig
Algebra
Area and properties of shapes like trapeziums
Relative and cumulative frequencies
Speed, Distance and Time formula
Ratios
Converting numbers
Well this is what i found i needed to know and i've gone through about 5 past SC papers. Most of it is just problem solving really - you don't need to memorise complex stuff like the cosine rule.