This is nothing extraordinary, there are many people having a math Bachelor or Master. Also a famous university name on your BA/MA tells nothing about your leve

This is nothing extraordinary, there are many people having a math Bachelor or Master. Also a famous university name on your BA/MA tells nothing about your level. University get their ranking through research publications not through undergrad math test . So what really matters is whereas you choose to dedicate (a part of) your life to Math or not, there is no secret magical course at Cambridge that will enlight you, courses are pretty much the same in all big universities