Practicing with past papers and exercises will help you become more familiar with the types of questions and problem-solving strategies required for the HKDSE. Good luck with your studies!
Here are some resources where you can find past papers and study materials for solid geometry: hkimo+past+papers+senior+secondary
Official past papers for the Senior Secondary level are rarely free on the main site but are often provided upon registration. You can find archived versions or mock sets on document-sharing platforms: Physics Wallah Practicing with past papers and exercises will help