I was interviewed last March for the access course I'm currently doing. During the interview all applicants had to sit an English and Maths test and needed to secure a level 2, or exceed it, to be considered for the access course. If you didn't secure a level 2, but passed the interview you were considered for the 'Access to Access' course (basically a level 2 course).
I'm not sure what the entry level qualifications are for your chosen access course and you may receive an offer, even with an entry level result in maths.
A word of warning though, please note that for many degree programmes you require A*-C grades in Maths, English and Science. Another point to note is, if you do require GCSE A*-C grades in particular subjects, many of these level 2 Access to Access/Foundation Access courses are not accepted by universities as equivalent to GCSE, so you may have to take the GCSE alongside the access course anyway.
Good luck