This is pointless, for multiple reasons.
To begin with, most universities don't use the UCAS Tariff, and those that do usually do not require very high points from the tariff (usually equivalent to like BCC or something...), and hence you can realistically meet those entry criteria without taking extra versions of the same course. So it's a moot point in that regard.
Secondly, university admissions staff aren't stupid. They're going to see you're just taking multiple versions of the same exam, and that isn't going to impress them particularly even if you do well in them (probably just make them slightly confused about why you are doing it). If you do badly in different versions of essentially the same subject, then that might raise some red flags about your actual ability in that subject, so that might even backfire.
Also this isn't something that will "stand out in interview" and the only unis I know of that interview for that subject don't use the UCAS tariff, so see point one again. If anything, they would just ask you in the interview "wtf?" (see point two), or more likely just ignore it and proceed with the interview as normal - which for those that interview (Oxbridge and maybe Imperial, essentially), will be trying to give you unfamiliar problems that you can solve with what you know, but that requires a bit of thinking to work towards a solution. They also aren't necessarily interested in the actual solution, but likely more how you reason towards it.
Finally, universities usually don't consider multiple A-levels with overlapping content (e.g. human biology and biology, economics and business studies) towards meeting entry requirements, so almost certainly will not consider multiple A-levels taken in the same subject.
Essentially, you are misunderstanding on several levels how universities assess applications for university study. The reality is that your proposed plan at best will make no difference, and at worst may harm your chances by either a) making universities raise an eyebrow at the fact you got an A* in one maths exam and a D in another one, or b) cause you to spread yourself too thinly preparing for the exams and do poorly in all of them.