I guess people in selective schools are more competitive, so there is more of a pressure to do well. But then again whilst competition is generally a good thing, it also has its downsides and can create excessive mental stress :/
The only legal textbook you actually NEED is Cambridge because it covers all the theory and also gives you cases, definitions, legislations etc. Excel is an optional add-on (maybe as an add on to what you read in Cambridge). You will do well in legal by knowing your Cambridge textbook, and by...