Marathon study sessions are not effective. Take advantage of the free hours you have throughout the day. Have a specific study goal in mind every time you sit down to study. For instance, a goal could be to read the first ten pages of Chapter 4 and make a list of vocabulary words. Do not just open up the book and start reading without knowing what you want to accomplish.
Passive study involves reading and re-reading material in the book, notes, etc.
It is easy for your mind to go to sleep when you are passively studying. Active study forces you to interact with the material you want to learn. Teaching someone else the material Answering questions from the end of each chapter Do not procrastinate. If an assignment or project seems overwhelming, break it down into manageable chunks. The next time you tackle it, you will not have as much resistance and, as you begin to see progress, it will become easier to work on.