Let’s address the elephant in the lab. When you search for "CL Arora Practical Physics PDF," you will find a lot of broken links on shady websites (like archive.org uploads that have been removed, or Scribd paywalls).
If you are a Class 11 or Class 12 student in the CBSE or other state board stream, you have likely heard one name whispered in lab corridors: .
Write your observations directly into it. Highlight the viva questions. A physical copy on the lab table during your practical exam will save you 10 marks of stress.