Student achievement tracker in Excel

I need a spreadsheet for teachers to track student assessments and achievements. The system needs to be simple to use and be locked down enough so teachers cannot accidentally destroy the systems by clicking in the wrong places. Some parts have already been done, but I believe it needs a complete overhaul to make it more effective and simple. Teachers need to be able to sort the student data by class, view their class' achievements as an overview, select the units that have been completed by the students and print off a results page. The units completed also change the students levels in their skill areas. This needs to be automatic eg. Student completes writing assessment. Teacher clicks the unit to complete it. Student's writing skill number increases. Unit completed is ticked off on the output pdf. Student view shows two rows of level, their initial and what they are at currently; and units completed in a nice list. More details available of course but this is a general overview.