Did that already. And my good score was 25. Every choice I had I helped him and spent time with him (except one time when I chose to study to get scholarship), but Ash begun brush him off more and more. Maybe I had too many bad points (around 10)? Maybe I can't spend time on study to help him?
From the game's code:
The variable that makes dad turn his life around is "dadok", to turn on dadok you need 5 dadlove points, here's a list of everything that gives dadlove points before the point you need them to get dadok to turn on:
Sleeping in the same bed as dad (you need 13+ good points, right after Eric tells you about going to Somalia)
Choosing "Well, it's been hard for me lately".
Choosing "That sounds nice" (this is the one you need to skip for an extra study point)
Choosing "Don't listen to her" (this one only pops up if you chose to go out with Jessica/Eva instead of studying)
Choosing "Tell him how I feel"
Choosing "I would like that" to sleep in the same bed as dad (only shows up if you also slept with him after buying a dildo)
Choosing "I didn't want to worry you" (only shows up if you still don't have 5 dadlove points)
As you can see there are 7 total dadlove points, 2 you can sacrifice for extra study points, so you can still reach 5 even while keeping up with the studies.
Now here are the things that can LOSE you dadlove points:
Choosing "It's a mess" when in a phone call with your mom.
Choosing "She's right" when talking with dad (only shows up if you skipped a study session to go with Jess/Eva)
Choosing "You can't help me"
Finally, make sure you tell dad to "Forget about her" when he is still thinking about mom, and say "Don't give up" after his first job interview doesn't work out.