Tactical courses are not so much about drills as situational responses. There's a disconnect here between technical handgun skills and the larger picture of action in dynamic situations.
Besides, as folks pointed out - running drills on your own is good but it's better to be observed by experts. I will demur on listing drills for that reason -plenty of media already exist for that.
In a sense it is like a DVD with sexual activity to observe alone vs. the real thing with other participants. The former only goes so far in one's development - pardon my earthy metaphor.