No like I want to have an extra unit (history ext) to like scale my maths mark up/ work as a safety net
Bad mindset & self fufilling prophecy. If you have to spend time on history ext, youre going to have less time for all your other subjects which will result in your maths suffering, and the miniscule benefit the extension subject gives wont be worth the decrease to the rest of your subjects. If you're worried about flunking maths your better off dropping it entirely or just locking in with all the free time youll have from not doing history ext. history ext really should only be done if youre super passionate about history.