I got a 3 and need a 4-5 what can I do quickly before November and what options do I have
It depends on your sixth form college. They can sometimes allow you to resit Maths alongside studying your A Levels, especially if Maths isn't involved in the A Level subject e.g. they're not physics, maths, etc. If not, then you would need to find an adult or vocational college to allow you to resit Maths for free.
In terms of revision, it depends on how you did things. Did you use past papers? Where did you mess up in the exam? What are your weakest areas? How far were you away from grades 4 and 5?