any one! p1 mathsWatch
Sequence and Series
Differentiation & Integration (Absolutely Guaranteed)
Co-Ordinate Geometry (i.e Equation of Line, Mid-Point etc...)
Completing The Square (Maybe Proving The Quadratic Formula)
Triangle Stuff (Maybe Mixed With Co-Ordinate Geometry)
Anyone Else Think Of Stuff I Missed
Also solving quadratics by substitution is fairly common, and simultaneous equations. Make sure you know the basic geometry/trig equations. e.g.
Area=(1/2)bcSinA for a triangle
and a^2=b^2+c^2 - 2bcCosA
Good luck everyone!