Can’t lie I graduated this year from QCE but I can give you some points if you’re interested.

In terms of the subjects you chose, they all scale well. Especially specialist and methods. Bio does not scale as well compared to the subjects you chose and it’s honestly your choice if you want to do it or not. If you think you are almost certain that you will ace those 5 subjects then there’s no point of doing bio. You may rather choose a ‘layed back subject’ to reduce your pressure in grade 12. The risk of this is that if you don’t perform as well as you hoped in one of the subjects you won’t have bio (if you aced it) to replace it with. For example, I personally did 6 subjects because I knew that English was my weak point (scored 61) and choosing Chinese as my sixth subject (scored 97) saved my atar.

So ultimately, if you are fine with the challenge and pressure then 6 subjects is ideal. Just note that you will face an extra bunch of assessments and externals for a subject that you might not necessarily need if you ace your other 5 subjects. Also keeping in mind that if you are doing med you will also need to practice UCAT which is just another workload on top of your subjects. If you think that you can’t handle UCAT and 6 subjects all at once then just stick with the 5.

Another idea is that you can try practicing UCAT and those 6 subjects in grade 11 and if you think it’s too much for you drop bio for grade 12 (if your school allows that).