A 3m41s vid on Endothermic & Exothermic Reactions (Bitesize Top 20 Demos):
Science Bank (Reactions & Energy Changes): part 1 – exothermic & endothermic reactions (just the first 4m 40s):
BBC Short Circuit Energy Changes – a 19m video.
TEXTBOOK REVISION
Complete Chemistry for Cambridge IGCSE, chapter 9, pp.114 – 115