I got several conditional offers from different universities both inside and outside London. However, I'm not entirely sure if I'm going to get 2:1 in the end. I mean, it's likely that I'll get it, but anything could happen. My grade last year wasn't very good. All offers require 2:1, however I think some universities may allow u to get in in case you end up getting something really close to that, for example 58-59%, however some universities may stick to 2:1 and will not let you negotiate in whatever circumstances.

So, I'm just wondering whether I could accept more than 1 offer now and see what happens? I know it might not be fair for other candidates -- but is there any other options??

I do not know what is the definition of "accept"?

I think as long as you have not paid the tuition fee, you can always change your mind.

"accept" here means - respond to the offer letter, saying you would 'accept the offer' as opposed to 'reject the offer'.
The reason is that I can't wait till the exam results come out because for most univs, you need to respond within 1 month from the letter date..

I think you'd better first accept the offers from u. that do not require your grade.(it's the most safe way, right?). And then, if your grade is good enough, you can change your mind later.

Is that possible?