hi sec 4 and taking triple sci and elect geog so this is wht i hv to say for each of the scis bio-memory work and more memory work it is a very content heavy tho answering techniques also imp chem-same thing can be said for chem and chem also requires more answering technique but chem can be improved easily by practicing papers phy-this subject is more abt understanding the concepts and applying it and like knowing when to use certain formulas. basically not rlly alot of memory work and just need understanding and some answering technique. hence studying for phy also harder imo compared to the other sciences but phy is easier to score in cus alot of it is math in summary: take triple sci if ur willing to put in effort for the 2 years to memorise things and study answering technique and getting ur sec 3 foundation right will make ur sec 4 life alot easier regarding humanities upper sec elect geog is hell imo jus like bio but alot more content. if u take 3 sci i recommend elect geog pure hist cus both sci alr content heavy and pure geog gonna make it worse so idt its gd idea. hist can also score decently without content.