I've been a test prep and admissions tutors since 2003. I have also been a cyber security consultant since 2014. I started as an SAT and GMAT tutor with Princeton Review. Whilst in uni, I tutored students. I then became director of operations for the Princeton Review in Texas and Thailand. After Princeton Review, I was senior course director for Prep Zone Singapore, wherein I developed a system of instruction that guarantees non-native English speakers excellent SAT marks.
All of my courses are affordable.
They are also affordable. Why? Because test preparation is inherently unfair. If you have thousands of dollars, you can hire someone like me to sit in your living room and walk you through the lessons. That will always be true. But the information... the strategies, tactics, and knowledge... those should NOT be super expensive.
These courses teach you all you need and afford you the opportunity to ask questions. Take advantage of these in your training and you will do exceptionally well on your exams.