HSPS written work submission

Hey guys, I’m applying to uni this academic year, in particular HSPS at Cambridge. In terms of the two pieces of written work that we have to submit as a part of the application - I’ve always been told that it has to be school work but none of my essays really show much individuality and essay writing skill per say - or at least not as much as I’d like to think that I have! I do: history, English lit, philosophy, russian, and drama (so all very essay based) but and i don’t know if anyone feels this way - the essays we’re set are quite constraining to the question - they don’t really involve any personal exploration of the topic, just the info and ideas from the textbook. Is this not a problem and am I just overthinking or can we present work we’re more proud of? Also, at the open day I went to, the lecturer mentioned that most essays submitted are history and sociology ones, as I don’t do sociology (not offered by my school) and history essays aren’t my proudest work which other subject should I submit from? Or should I stick with history? Thanks in advance!!