We've pretty much finished too. BUT I dont think you're 'completely screwed' if you havent... there's still 1/4 of the year left.. an entire term! theres no rules saying you must be finished by the trials, if youre not, youll only be assessed on what youve done. As long as youve got it done before the exams, its not a problem. Sure, you'll have less time to revise, BUT you'll have only just finished it, so itll be fresh and take less revision. You;re best moving at the pace your class is comfortable with, rather than rushing and learning it piecemeal.
My class was fast because Indochina was easy, as we all went there for an excursion and study tour last year, so we learnt it then, and we saw all the places and stuff.