suggestions for Spanish DELE exam class? (Quito)

I'm interested in taking the DELE exam this summer or fall and wanted to see if anyone has suggestions of a Spanish school that's been helpful to them in preparing for that exam...I've found the following schools using a google search: Intensive Spanish Ecuador, ISE, Ailola, and the Yanapuma Spanish School and wanted to see if anyone had recommendations on any of them or any others in Quito. I'm especially looking for classes that don't have add-ons like salsa classes, etc. as I'm trying to find a class that's as affordable as possible. Gracias!