Abbott’s greatness is in his simplicity. Take a blank sheet of paper. Close the PDF. Try to redraw the diagram of the "Compound Microscope" or "D.C. Motor." If you can redraw Abbott, you understand the concept.
Ironically, while you want a free download, you can often buy a used physical copy for $5-$10 plus shipping. Scanning that copy yourself (for personal backup) is legal in many jurisdictions (Fair Use). Ordinary Level Physics A.f. Abbott Pdf Free Download
Abbott opens every chapter with a crisp, exam-friendly definition. For example, instead of dancing around the concept of inertia, he states it clearly and moves to examples. This makes the book ideal for last-minute revision. Abbott’s greatness is in his simplicity
Physics is spatial. You cannot learn vectors on a glowing screen. Print Chapters 1–10 (Dynamics and Statics). Use a highlighter on the definitions. Try to redraw the diagram of the "Compound Microscope" or "D