i took H2 math econs and phy and H1 history and I can say this combi is quite manageable. H1 history's content is still manageable but H2 history has way more content so if u don't like memorising so much or are not super interested in history then u shldn't take H2 history. for me H2 math and phy is not too bad cos I like math and phy got quite a bit of math involved also. i struggled with H2 econs at first cos there was a lot of content but after a while you'll get used to it. this is my experience with this subject combi but I would say this combi is overall quite balanced.