generally just hang out with the person you like the most and agree with them, also you can check the point counter after choices to see if it increases. If it doesn't just redo the choice until it does.
I already did that, I used truthful answers for day 2, helped him on day 5, and told him sorry on day 4, unless attempting to hide with him at the party redacts a point, For me it was only possible to get 9.
