This may not be the answer you're looking for but I'm going to give my 2 cents. This is actually the same with every book we read or subject we study. It is imp

This may not be the answer you're looking for but I'm going to give my 2 cents. This is actually the same with every book we read or subject we study. It is impossible to remember everything all the time. It is actually the deductions we do while studying / reading. That is what improves our brain and thinking ability. Thing we call knowledge will go away, we will always check books and websites if we are not using it frequently. I really like what Einstein said: Never memorize something that you can look up!