Always it is a complain from many students that they do not remember concepts taught and learnt as time progresses. Even exceptional students also falls pray to effect of time fading. The tip which i generally give to many is one should live with concepts and techniques. Living?? may be surprising . . . !!
Here is the simple rule
1. Reading
2. Associating with surroundings
3. Repeating
For example, when one come across the concept of noise, first reading and understanding, then associating with CPU noise or fan noise or bike noise, finally whenever one heards of noise must recollect the concept of noise.
Though looks simple, living with concpts is only possible over a repeated practice.
Happy Learning