You should try tdrama Gloomy Salad Days, it is one of the best dark dramas I have encounter after LIFE. Hormones  and Hormones 2 are also good Thailand lakorns that deals with darker high school issues. 
Last friends deal with a lot of dark issues such as lgbt, pregency, domestic abuse just a lot of dark stuff it's a jdrama it's not high school but I'm sure if you like LIFE u should like this
and also check out god please give me more time = high school drama extremely sad 
Three more dramas that haven't been mentioned so far (but that don't necessarily fall into the two categories you mentioned in your original post):
Nobuta wo Produce
Dragon Zakura
I Am Sam

Oh and for movies I'd recommend you Sunny; half of it is set in high school, the rest shows the girls meeting again as adults.