As look would have it, the areas I was due to cover with 5th and 6th yr students were circular motion and the whole world of electricity and magnetism - and these are the areas for which I was least prepared in terms of PowerPoints. But at least prepping online classes on those areas forced my hand in finally getting around to a task I'd been avoiding for a number of years. I've uploaded the resulting ppt files in the mechanics and electricity sections.
I also put up a few files working through past LC questions.
And on the topic of past LC questions, I've been admiring the work of Noel Cunningham, and others, in setting up the Pooled Resources pages for all of the LC sciences. They are available here: