Do you have to do the labs with the lecture?
I found my biggest time drain was NOT studying, it was paperwork for stupid lab reports, which had very little value, except that if you didn't do it, you failed lab.
Jobs: depending on job, could make yourself some index cards to look over at work between things.
Commute: Could record your lectures and listen to them while between school/work/home.
I left the house on Sat AMs while I was in organic to go and do practice problems by myself for 4-5 hours, while DH stayed home w/son.
I was also super anal about keeping track of my sylabi. I became pretty talented at selectively skipping lecture when it wasn't going to be useful.
I would also send an email to your profs at some point explaining how full a load you're carrying, or visit their office and explain, and ask how to optimize your studying. It will be harder for you to deal with things like last-minute changes for exams, or other randomnesses instructors sometimes impose.
If you feel like your GPA is suffering, you should consider cutting back on something -the cure for a low GPA is far more time consuming than waiting one more semester to take that class.
Stay healthy! Eat decent food! I got really sick at the end of last term, and I know it was at least partly b/c I was too busy and stressed.
Good luck!