HELP!! Best Revison Book for GCSE MATHS 2018

I am retaking my Gcse Maths(Edexcel and Higher Paper) this May/June what is the best revision book i can buy and which is up to date with this current Specfication.I am terrible at Maths and i have to somehow get a Grade 5.Which Book is the best to help me ?

CGP are good. I'd recommend the revision guide:

https://www.amazon.co.uk/GCSE-Maths-Revision-Guide-Higher/dp/1782943862

workbook:

https://www.amazon.co.uk/New-GCSE-Maths-Workbook-Revision/dp/1782943889/ref=pd_lpo_sbs_14_t_0?_encoding=UTF8&psc=1&refRID=VE3TGWBHSFAV2ZY1TY60

exam practice book:

https://www.amazon.co.uk/GCSE-Maths-Edexcel-Practice-Workbook/dp/1782944036/ref=sr_1_4?s=books&ie=UTF8&qid=1521067283&sr=1-4&keywords=cgp+exam+practice+9-1+maths

practice papers:

https://www.amazon.co.uk/GCSE-Maths-Edexcel-Practice-Papers/dp/1782946594/ref=sr_1_1?s=books&ie=UTF8&qid=1521067308&sr=1-1&keywords=cgp+exam+practice+papers+9-1

Also, a revision checklist can be good. Here's one I made with questions and a PDF checklist but MathsGenie is also good for that.

Cheers mate, Do you think i should target a Edexcel Specfic Based Workbook ?

The content is the same so for revision guides/workbooks a generic 9-1 guide is fine like the CGP books I linked. For exam workbooks and practice papers it's best to choose Edexcel and the bottom two links I gave you are Edexcel specific.

I only have around £10 to spend,what would be the best two combinations to buy