Use the GCSE Warmups to work on basic skills as well as Lighthouses 4, 5, 6, 7, 8, 9
There are also some old GCSE papers that will help you with exam practise.
Look back through your targets to improve on and find them on Maths Genie and Corbett Maths.
Finally visit Corbett's 5-a-day (use the Foundation and Foundation Plus questions with the Higher as Extension).
You might find the GE revision pages useful too.