It really comes down to whether you have the commitment and can study hard.
I did the highest possible maths in year 12 and I still struggled with the maths.
But people who were worse at maths but better at applying themselves to lots of study managed quite well.

So i guess if you want to study and I mean really want to not just haven't got anything better to do then definitely do it.
If you feel kind of sick of do school and that sort of thing then probably get a job and go back to uni later.

Have to say friends make or break you when the going gets really hard. You work together and end up tutoring each other in the stuff you are better at. Having someone you know in the year above you is extremely helpful!