There are brains I think I’ve come across for whom maths are easier than reading… (Not mine, unfortunately. But on the other hand I can usually Lord it over a math whiz on the Essay Question)
As with almost any skillset, performance ability for maths is related to nature and nurturing. If nature has given you the proper brain, optimum nurturing will result in optimum maths skillset. If nature hasn’t wired you well, optimum nurturing will improve you beyond poor nurturing, but not beyond some lower performance level. If nature has wired you well, you will not need nearly as much optimal nurturing to attain the same skillset level as someone with a crappier brain for maths.
For this reason, some individuals exposed to superb teaching for maths never catch up and some catch up in very short order…the same would be true for almost any skillset, be it physical or intellectual.