It all depends on how you study. If you understand all the concepts regularly, practice different types of questions, it would be very easy to score good points in your exams, but if you continue to delay, it will be very difficult for you. In the end, your formulas will mix-up. It would be difficult for you to remember the formulas because there are many formulas that you cannot learn. Instead, you can only memorize them if you practice questions based on the repeated application of these formulas. Keeping everything to the end is a mess because you also have other subjects to study and you won't like to study and you'll be frustrated. So keep practicing regularly and it would be very easy.