There are a range of resources freely available on the OCR qualification page for the FSMQ.
As a private candidate, first check to see whether the centre that you have registered to take the exam with has access to the free FSMQ resources on the MEI Integral learning platform. If they don’t, you may be able to ask them to complete the sign up and provide you with access to a student account in order for you to access these resources.
If the centre is unable to help you then your Maths Tutor can contact MEI directly to ask for assistance in setting up a free MEI Integral account for access to the resources.
You may also find further support from the Advanced Maths Support Programme.