Effective PSLE Science notes in PDF format should have several key features. Firstly, they should be well-organized and easy to navigate, with clear headings and concise notes that cover all the essential topics. Secondly, they should include relevant examples and illustrations to help students understand complex concepts. Thirdly, they should provide opportunities for students to practice and apply what they have learned, such as through quizzes, worksheets, or past-year questions.