Getting your students well-prepared is the goal of CERM7. For that reason, the examples and practice problems are often deliberately more difficult than actual examination problems. There are many practice problems for each major examination subject. Capacity assignment should be the goal of your courses. If you assign 15 hours of homework per week, and a student can only put in 10 hours of preparation that week, that student will have worked to capacity.
Students like to see and work lots of problems.
They experience great reassurance in finding out how easy the problems are and that they can solve these kinds of problems. It isn't always necessary to grade individual homework assignments. Have students turn in completed problem sets for credit each week and address special needs or questions written on the assignment. Each week, lecture for three hours, with an intermediate break. A realistic sample examination is beneficial for your students but sitting for hours in the late evening to take a final exam may be too much.