You need to meet him at the forest prior to Wed. preferably monday or tuesday, this is the tackle event. (i dont think it matters what choice you pick) after that you need to skip class (you need 4 BAD points) and find him somewhere to accept him and then proceed with his route (prior to Wed. too). after this, you need to actually go to class on wednesday to be prompted w the midterm promp BUT you also need 10 strength to ask abt his smile (I suggest bellatrix + one strength raising class like combat). after this, meet him in the library by studying. after that, just meet him places he usually is (kitchen, bath, garden). then you'll have two events with him when you get to the weekend event...do not get involved (as in do not stop him). As for your crypto class make sure you select 'bugbear'. I think the main thing to remember is to not skip class on wednesday, and to make sure you do not skip your crypto classes.