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There is a bit of information in the poll
As for a response to OP:
The information probably still isn't enough for me to give a clear judgment on whether you should do spec or not.
I think one of the most important attributes (possibly even more than year 7-10 scores given no one really knows the difficulty of those sacs) is whether you actually enjoy maths and want to study spec.
However, it is still early for you so you can study it in year 11 and see if it suits yourself and then decide at the end of year 11 whether you want to stick with it or move to something else.