Why do you fly? What's your motivation?
If you spent 18 months already and have only done two exams so far, then maybe the PPL is nothing for you, theory-wise, and you should consider doing something else with less theory requirements. Gliding perhaps.
And if you do not feel motivated to study the theory because it doesn't live for you, then you might ask your instructor to do some flying specifically to let the theory come alive. For instance:
- Aircraft technical, aerodynamics: peak performance flying such as aerobatics, short field, high altitude.
- Human behaviour and performance: high altitude flying with oxygen, night flying, instrument flying
- Met: Do some flights in marginal conditions, maybe in anticipation of an IMC rating later on. Look for conditions where an inversion layer is present, fly through it while noting the OAT, look for visibility changes.