As you hear the lecture, visualize what the Professor is talking about.
When you read a chapter, visualize what you are reading.
That is what I do.
Many people are visual. So, with that in mind, visualize what you hear and read.
Taking notes is visual. To me. You hear it then write it. It then reinforces what you are taking in mentally or via your ears.
You also need to get organized and time manage.
Using things like a desk calendar on a wall, so you can SEE it after you write in what is due etc.
Use highlighter pens to organize your classes and color code it.
MAKE an actual schedule.. of WHEN you will study and for how long. And keep to it.
Keeping things organized and being... organized, are two different things. One utilizes keeping objects in its place. The other takes, keeping you... in place. ie: being on task. And focused on completing assignments.
Other Various Tips:
1) Chew gum, as you study. It helps one to focus and concentrate.
2) Get an iPod and ear buds, and listen to music as you study. It will keep out unwanted distraction.
3) As you study, squeeze a "stress ball" in the other hand. It will help you to focus to the task on hand.
4) If you are a coffee drinker.... don't drink too much. For some, this makes their brain too unfocused. But for some, it helps them to focus.
5) Hyland's Calms Forte (for adults), helps with stress but does not cause drowsiness. Its a pill. One of those homeopathic things. I have used it.
6) KNOW that the more you procrastinate, the more things will not be done. And then you will have to cram it all, at one time, and may not get good grades. So just plunk down, in a quiet room or go to the library, to study.
7) If you cannot, complete your classes or assignments, and don't get good grades, and if you have to withdraw from a class, you will lose your money. And that is a lot of money, per class per credit hour.
Tell yourself that. That is a repercussion of not doing school work.