Not sure why 7Sage recommends students to write one. It's not mentioned anywhere on the application and I attended an info session where they basically said it doesn't matter. My two cents: if you can write a really strong one, include it, but don't…
While it's probably good advice for most people to study for more than 4 months (7Sage recommends people study at least a year), keep in mind that services like 7Sage are incentivized to keep you studying for as long as possible.
I've been studying…