dun think that way... dun think of it as days... think of it as i need to get ready, i'll stop procrastinating now... you probly can afford to take a day off today since it's strike, but yeah, ease back into it, give yourself some rewards for hard study, develop a cycle.
Remember, HSC is a game; play to win.
how about add a lil spice to it? like say...revise with ur friends? if u do physics can as them questions and if they don't understand, u explain it. yeah...something like that, i haven't tried it yet but sounds cool if u get most of the answer right, kinda boost syour confidence up and u'll be in the mood to study. i don't know try it if u really find it boring and don't want to study no more.
For me looking at the things you want to experience after school like university and all that stuff gets you motivated.
Also what I've been doing lately is working with one of those university pens, so when I want to stop and have a bludge I look at it and go yeah I better do some more work.