Excel - Entering marks - Validation, Conditional formatting and Vlookup

I used Camtasia to create the following clips relating to working with marks in Excel: the first is about checking that (slow) and (fast) download of valid marks (Validation) are added to a marksheet, then showing how the highest and lowest marks (Conditional formatting) can quickly be seen, and then how to add a code (Vlookup) slow and fast download to a percentage. Please WAIT to view them and make sure your speakers are switched on.