+1. but seems like u are not a maths-y person based on the subject that u are doing. i think u should drop it.Imo, prolly do your best to turn it around for the yearlies, if you can't manage to, then drop.
I know it's not helpful but should really do what you think is best.
dont think about dropping me too early as a few people i know got only 50s% for their half yearlies last year and then came back at the end of the year to get like 80s%. She is now doing 4 unit despite not getting the best results her average for 3u is like 75%(quite high actualyl considerring everyone did bad in half yearlies) and 60% for 4u. It is not the best results but it is estimated that if she continues to maintain such results she will probably get low 80s for both of them which are great results.
Also you can always do 3 unit next year for whole year and then drop it b4 the hsc. so keep your options open and do not jsut think because of this i have to drop this and that.
it is just like me last year how i was going to drop legal as it wasnt in my best 8units but good thing i didnt drop it as i am not doing so great in chem and currently like in top 10 for legal.