This revision video covers the topic of respiration in the BY4 module of the WJEC syllabus. I think it also applies to the HB4 module too. This will probably apply to any biology specification. Note I have written NAD & NADH instead of oxidised NAD and reduced NAD respectively to save space (the same for FAD); be careful which notation you use in the exam as NAD and NADH are not accepted by the WJEC exam board but are accepted by others. Check with your teacher which notation you should use. The song in the video is 4 Strings - Take Me Away (Dave Darrell Remix).