Studying is the last thing anyone wants to do, but its important that you do it. To become an effective studier you need to limit the amount of distractions around you while studying. Don't be on your phone while studying and try not to take too many breaks. Have a study schedule so you know what you need to study each night. If there is something you don't understand set aside a good amount of time to cover that subject. Don't waste time studying something that you already understand. When you find out you have a test start studying a few days before so that you don't cram the night before.