Redraw the diagrams from memory. If you can sketch the "convection current in a room" or the "particle arrangement in a solid vs. liquid," you have already won half the battle. Are you currently studying for the 1B exam? What topic is giving you the most trouble—Energy calculations or the particle model? Let me know in the comments!
If you are looking for the PDF to avoid carrying a heavy bag, consider purchasing the through your school’s portal. If you are looking for the PDF to avoid reading the textbook—unfortunately, the diagrams in 1B (especially the heat transfer experiments) are exactly what you need to pass the exam. Aristo Science 1b Pdf
If you are a Secondary 1 student in Hong Kong (or following the local curriculum), you’ve likely encountered the Aristo Science for New Century series. While Book 1A introduces the basics of science and life, Book 1B is where things get moving —literally. Redraw the diagrams from memory