do they collect labbook at the end or at any time?
we always just hand in the lab report but I was wondering if they would just randomly want to me to hand in my lab book

No, last year when I took it, they never collected it. At the end of each lab, my TA would sign the last page. At the end of the course, we had a lab exam and they would check it very briefly during the exam. Other than that, they do not collect all the books from students and mark them.

Refer to what was said in this thread. I think you'll find it helpful .
http://www.macinsiders.com/showthrea...light=lab+test