Look at your ECs and figure out which are the truest to you- where you have put most of your time / effort / commitment. If some of them naturally group, put them together. @BKSquared is right: you have a tiny window of time to catch the reader’s interest. You want it to be easy for them to see what’s important to you- and how that links to other things in your app. For example, if you talk about a character trait you developed in one of your essays, did you connect the dots and note that that trait has also been an important part of your leadership in EC X? Note that this is an example- it might not work for your actual ECs & essays! Mostly it’s a suggestion to look at your application as a whole.