The resources below will help you improve your mathematics to an "expected" level ready for the start of GE.
Firstly we have some basic skills work:
Pass Learning Lighthouse 2, 3, 4 (some of you will have already done this, if so just practise them a little)
Regularly score 28+ on the Numeracy Ninjas
Work through these short "5-a-day" sheets (dates are suggested, you can do them in any order you wish).
Great websites help for use with your CGP workbook (and the papers you sat in May)
Try your luck on these FOUNDATION IGCSE papers (don't worry you will be doing Higher in 2020)