No-one here can make you read your textbooks, concentrate in lectures, etc. You need to find your own way of making yourself sit down and do it. I've been going through a period of putting off assignments 'til the day before after I fell behind when I was ill. I'm now in the position of just doing the work, regardless of how unsure I am of what I'm doing. There's no other way 'round it.
I do some preliminary reading a couple of days before each lesson so I'm familiar with the topic and don't feel like a complete moron (which is when I end up switching off). I also make a lot of notes and scribble questions to myself to look up later.
As for the job application... If you don't do the research, you'll never know anything about it and you'll continue to be stressed. Read the info then apply. Stress-be-gone.
Edit: I'm sorry if that sounded harsh, it's just that everything you've described is self-inflicted. You're stressed because you haven't done the work, so the only way to relieve your stress is to do the work.