Practising old question papers is one of the proven method to score more. Normally high scoring students develop the habit of collecting the questions asked in board examinations during the first time they learn the chapters itself. However, it’s also a good idea to practice the whole question papers once the portions are completed.
For good scores you should have a collection of at least 10 different question papers of every subject. Try to find the answers to all the questions and show your teacher to get it corrected. Like that if you solve 10 to 25 questions you u can expect and excellent score in Cbse physics, no doubt.