Create a study schedule:

Dividing and arranging the study material into different difficulty levels are essential for a productive study session. Begin with the difficult chapters so that you have enough time to get all the concepts cleared. Crossing out the difficult topics, can help one relax and study the easy ones later.
Next, prioritize study times according to the points worth for a chapter. Some exams and chapters are worth more points than others. Some professors even allow test corrections. Evaluate all of the exams, determine the involved factors and study accordingly.
One should also try studying by making their own study guide. For tests with multiple choice questions, highlighting the key words makes it easier to review. It also helps to write down the core concepts in a sentence for theoretical topics.

Attend review sessions:

Most of the core science classes have supplemental instruction (SI) sessions. These sessions go over important topics, so one can check what they might have missed while studying independently. Some SI instructors also use interactive quizzes where students can participate and learn the concept.
Also, the Student Success Center offers free tutoring for subjects like mathematics, chemistry and biology. It always helps to take an appointment beforehand to make sure there are tutors available before a big test.
One can also use the study rooms in the library to get in groups and discuss the concepts with each other. Remember: Knowledge grows when shared. Teaching others helps retain the concept for a longer time and learn something they might have missed earlier.

Take breaks:

All work and no play makes Jack a dull boy, and a dull Jack is the last thing needed in the exam hall. Balance is the most important factor to ace a test. Take breaks between study sessions. But remember not to go overboard with breaks. An hour-long study session with 30 minutes of surfing through Facebook is not an hour-long review anymore.
In addition, proper rest is very crucial before an exam. Eat healthy and sleep well instead of cramming the entire syllabus a night before the test. Lethargic mind and unhealthy body cannot function well, making it difficult to take the exam.
Time management is also really efficient on the test day itself. Before starting the exam, always check all the questions and start with the easiest ones. This technique will help you keep calm and confident throughout the exam.