There is not “single most effective system” it simply does not exist in a world of such diverse creatures as humans (and other animals).
Our brain works differently, we are brought up differently, we have had different teachers, watched different movies… all of our experiences shape us differently and it makes the best method of learning and studying different for each individual.
It is a constant experiment for the individual and something that can always be improved.
It is like physical exercise… They say “oh this is the single best exercise EVER” well, if you do not like the bloody exercise, it does not matter how good it is, you will never perform the exercise to your fullest potential because you dread doing it. (I have been meaning to put that into a reference for a long time now! )
I can conquer to active learning though. However, I believe there is not a single way to do active learning.
For me, active learning is much about referencing what I learn in Sleep science to something in the science of resource extraction for instance. (I do not actually think I have made such a reference yet, though it puts a good point ). Oh, and sleep science probably have a technical term I should know but have forgotten.
You try and read Why We Sleep by Matthew Walker and tell me if you remember all the sciency words he uses!
The Aboriginals of Australia would make unique ceremonies and dance at special places in order to learn their knowledge. Which, I would also call active learning. (Reference to Memory Craft by Lynne Kelly )
(Umm, seems that almost every post I make I end up referencing Memory Craft… but i swear I am not getting any commission!)