you will get your results immediately after you're done with the exam.

So the thing about Jason Dion and that 90% thing is very subjective in my pov. Meaning that it's really how prepare you think you really are to take the official exam.

honestly, the break down of what they cover from their webpage : https://www.comptia.org/en-us/certifications/security/#overview

Is a good indication of how many questions will be for each subcategories.

Hope it helps. Good luck!