To effectively revise Physics and Chemistry, start by reviewing your notes and NCERT textbooks, focusing on key concepts, formulas, and reactions. Make short summaries or flashcards for quick recall. Solve previous years' questions and mock tests to identify weak areas. In Physics, practice numerical problems and understand derivations. In Chemistry, revise periodic trends, equations, and mechanisms. Use mnemonics and diagrams for better retention. Allocate dedicated time daily for revision, alternating subjects. Teach concepts to yourself or others to reinforce learning. Lastly, stay consistent, avoid last-minute cramming, and take short breaks to keep your mind fresh and focused.