I suffered for a bit as well orz, had to just invest in going to extra lessons / if you have the pc or shower at home leveling up during night. As long as your love meter is doing okay and you've been spending time on that, you can afford to skip on spending time with one of the boys for a while (although that's sad i know haha)
If you're willing to put in a bit of annoying work, what you can try is save just before you try to do the lesson and if you dont get a decent score then just load and try again... I would aim to increase the stat by at least 6, if not I would try again. In your case, there is quite a large way to go, but I think after a month or so the difficulty gets a little easier (I failed most of my jobs until September?). And I made sure to drop the job before the audition day if I knew I wouldn't make it, that way I would have that day to go to lessons (if you try to go with not enough stats you just waste the day).