Oooooh, just a word of advice!! You might want to edit:
does not really make sense to study all that material if all I am interested in is becoming a flight instructor
You will be teaching tomorrow's Commercial Pilots!!!!!!!
Even if it were not mandatory, I would not recommend going straight from PPL to Instructor! I found the hour building for my CPL invaluable - you learn all sorts from your mistakes (whether other people will admit this or not!) and the skill level needed for the CPL flight test is that much higher than PPL.
Moving up then to Instructor, you not only need to fly better, but you need to be able to explain what you're doing, why and how!
IMHO it would be mad to not do a CPL even if not necessary
