Calorimetry can be difficult to learn for some students.
Be patient - and stick with it and you'll figure it out.
I've included a few 'extra' videos for you explaining the history of calorimetry and the basics in brief videos.
Day 1) Watch videos 1-5
Day 2) Watch video 6 and re-watch others as needed.
Day 3) Work day for Calorimetry 1 WS
I'll also introduce mixing of two objects type problems.
Day 4) Work on Calorimetry 2 WS