I'm doing a science subject and 25% of my mark is assessed from the particals - lab manuals that I hand in. They are due usually a week after the prac. Also attendence will be assessed - less than 80% and they can fail you. Sometimes, you may be assessed on prac stuff like in school - it really depends on your subject and what your teacher wants to assess you on. Although, by now, you should know what your being assessed on.