Units
Nail these ones first, you will need the skills on the rest.
We are going to apply the algebra skills deeper into other topics now.
Problem solving skills to the fore, with a great big dollop of multiplication.
Unit 12 Right Angled Triangles
If you are pushing for a grade 5 then these are your nemesis. Ensure you have skilled up on the previous units.
Unit 17 Perimeter, Area and Volume 2
Unit 18 Fractions, Indices and Standard Form
Use the PLC below and focus on Units 1-5 where you are nope or Bad. Then do the same with 6-10 and 11-15. Personally I would stop at 15 unless you are going for a grade 5. When you are OK at 1-15 then it is worth doing past papers and problem solving.