Studying past papers are valuable part of exam preparation. The past papers are most helpful tool to prepare for your exams. Practicing previous year papers helps you to get used to the format of the question, how to manage time and how much time to spend on particular section and many more.
It helps you to find important topics to focus on in revision. It helps you understand the most likely topics that are included in the exams. Practicing past papers also helps you to develop practical time management skills which are essential to achieve the best possible grades.
Practice as much old exam papers as you can. It’s the most effective way of preparing for exams.