Yeah I got that later on, had to skip 1st class to not get game over. Now Idont know how to get girls to work on IFaq. Just wait for the story? Already had call from IFaq guy to bring girls in.
Yeah, as mentioned above, you need to raise each Girl's Friendship and Corruption. Talk to her face-to-face to raise Friendship, also send her texts; Friendly texts raise Friendship; sexy texts raise Corruption. You'll have to do that a fair amount to start with until you get the girls to 100 Friendship / 100 Corruption. Takes about a game month for each Girl, but you can do multiple Girls at a time, of course.
I make that my 0900 ritual every day, right before Morning Class: I leave school, go to town, check the Subway Station and Train Station for Lucky Charms, then talk to each girl in town face-to-face. Then I go back to school, talk to each girl in their classroom, then send anybody who I have phone numbers for a Friendly text and a Sexy text. At that point, I'm ready to go to morning classes and start the day.
To be honest, if you're already far enough along in the game that you've gotten that 3rd Strike for the Library book (which happens in v1.6,) and you *haven't* gotten your friends up to Ifuq yet... well, you might consider starting over and leveling the Girls from the get-go. Because you are a veeery long way in at this point. Your five Slattern's besties can typically be ready for iFuq by about the end of October; the next six by around the end of November / early December. I'm not saying you have to. Just saying you could. Either way, you've got a little work ahead of you!

Thanks for asking, though!