i plan to take 4 a levels all the way through. i’m aiming for a russell group uni, and i know selection of a levels matters. i want to do engineering, and i have to take maths, physics and further maths. would it matter if i took a non-facilitating subject as a 4th option? was thinking about politics, classics or philosophy - something essay based. if not, i’ll probably just go for history as a 4th option. opinions?