lol. ive completed my spesh hw which was like 1A-C. im just gonna learn spesh as we go in class i think.
but i reckon you should go through methods. even if you just learn the concepts and do a few questions, then you wont have to spend much time on it throughout the year; plus spesh covers some of methods as well 
maybe start on chem if you have time.
Chem is actually quite difficult to start without being taught. Getting ahead in methods is actually a huge bonus because it's quite a large course and you see a lot of students falling behind because it has to be taken at a very fast pace. If you use essentials, just compare the methods and spesh textbook...

Plus, sort of like what swarley said, methods covers a lot of basics for spesh. It's also extremely beneficial to work on spesh, but it requires sooo much concentration.
Otherwsie... just read English texts.
