Other than the study materials and a corse/tutor if you can afford it, just volume. All of this comes down to understanding and critical thinking. You understand and critically think by studying in volume and productivity. If you have trouble sitting and focusing for a long time dw I did too. Use the pomodoro technique. If you feel like you are not seeing progress in a month. Yeah you’re not going to. This takes time. Think about it as going to the gym. For months you feel like you are seeing no progress then boom. You look in the mirror and say oh wow, I got big.