@theone8181 Thought I'd come back to this and post some stuff that you might find useful. Just looking at that module you mentioned - it seems to be a methods module focused on 1st and second order ODEs, multivariate calculus, linear algebra and an intro to PDEs.
It looks like there is a diagnostic quiz which you can find here:
http://www.open.ac.uk/courses/Cours...on/Infographics/MST224_self-assessed-quiz.pdf
If you are able to skip the first year/120 credits and save yourself a few grand + a year or two of your time then given you've said that your maths ability is pretty decent and you'll have people to help and given that you've got some months to go yet then I'd say you've got plenty of time to refresh your knowledge from college and or fill in any gaps (since the syllabus of the level 1 modules the other poster mentioned basically cover not much more than a-level stuff anyway and some of the stuff covered isn't necessary for the module you're aiming to study).
There are plenty of resources out there to both help you get up to speed and fill in any gaps and of course stuff that would compliment what you'd be studying in that module too, the below book starts at A-Level and as the title suggests covers pretty much all the maths needed for the typical engineering, physics etc.. degree:
https://www.amazon.co.uk/Mathematical-Methods-Physics-Engineering-Comprehensive/dp/0521679710
(there is a solutions manual available too)
If it is just revision you're after then you could use the first few chapters of the above book to get up to speed and use the rest as complimentary material to look through when taking the course, it actually covers a fair bit more than the module you're aiming to take and so is good reference to have for engineering mathematics in general. It is quite concise/brief if you're using it for stuff you've never encountered - this isn't necessarily a problem if you're going to spend time working through the problems etc.. though if you want a bit more explanation etc.. then check out the below links.
You might also want to take a look at MIT open courseware which contains video lectures and notes/problem sheets etc... for example these courses would be useful:
This course for revision before you start the module
https://ocw.mit.edu/courses/mathematics/18-01sc-single-variable-calculus-fall-2010/
These courses overlap a lot of the content and perhaps cover a little bit more of these topics... maybe useful if you want to watch some additional lectures rather than reading a book etc.. Gilbert Strang's linear algebra course is decent:
https://ocw.mit.edu/courses/mathematics/18-02sc-multivariable-calculus-fall-2010/
https://ocw.mit.edu/courses/mathematics/18-03sc-differential-equations-fall-2011/
https://ocw.mit.edu/courses/mathematics/18-06sc-linear-algebra-fall-2011/syllabus/
Also if you want more practice (never a bad thing with maths) then the Schaum's outlines series of books are cheap and contain a load of problems for you to work through, might as well grab some covering calculus, differential equations, linear algebra etc.. for example:
https://www.amazon.co.uk/Schaums-Outline-Calculus-6th-Outlines/dp/0071795537/ref=asc_df_0071795537/ etc..