You'll be able to book Essay Reviews immediately following your Sanity Check booking (you'll receive the link to book Essay Reviews in your confirmation email).
We do NOT recommend scheduling an Essay Review RIGHT after your Sanity Check though (and definitely not on the same day!)
The feedback you receive in your Sanity Check may change how you approach your essays (particularly if you need to make adjustments to your Career Vision!) - we'd recommend giving yourself at least a few days following your Sanity Check to incorporate this.
We'd also recommend giving yourself a few days in between essay reviews if you're planning on scheduling reviews for multiple schools - the feedback you receive for one set of essays may (and likely will) be applicable to your other essays. You'll want to give yourself time to adjust things accordingly to get the most value out of your essay reviews!