When it comes to studying there is no right or wrong way. It really depends on how you process and learn new information. My first advice would be to look over your syllabus and make sure you scan through the chapters before each lecture. Get an idea of what the section is about and during lecture, write your notes in your own words. Don't copy the powerpoint, it doesn't help you learn, it just wastes your time and energy. Now, as far as studying after the lectures, what worked for me was to quiz myself. Try to do the questions at the end of the chapters to make sure you learned the material. You could also form a study group or find a study buddy and you guys can make questions and exchange. Be careful with study groups. Don't form study groups with friends because you can easily get side tracked. Also, if your professor have a teaching assistant go to their office hours if you have any questions and want to clarify anything. They are a great resource. Good luck and I hope that helps! :)