One subject in two elective slots
A subject can now be offered in two elective slots at the same time — Applied Mathematics as both an Optional Subject and an Additional Subject, for example — so you no longer have to create a second "(Optional)" copy of it. The electives screen tells you when a subject is also offered elsewhere, and Student Mapping greys it out for a student who has already taken it in the other slot. The duplicate copies your school created as a workaround are merged back into the real subject, so marks, teachers and report cards line up on one subject again.