For Jet trainings you can use the cheat mode in your room to skip her trainings,and save Changs daughter.
For Sarah i don't quite remember but you don't need her to advance on Dad/Maria quest line but you need her to start Jets quest whwre you have to save her from the guy.
Yes i know that Sarah is not needed to advanced Dad/Maria
But for unlock Jet the first thing to do, is to fuck a girl/woman for the first time.
And you cant fuck Rachel if you do not advance partially Maria quest, because after Maria see you in the alley with Rachel you are grounded at home to do chores. So every days Maria wait you close to the door home and say to you, clean the bathroom, or the dish or do the laundry. After you go to school automatic.
Sarah is needed because she unlock nesrot, and without nesrot girls now i do not remember her name, you cant save Jet from the rapist. Sarah quest lend you in the comicstore or like is called where you need to obten a new Tinymon card. After that, you unlock nesrot if i am not wrong.
Also Maria quest need to advance till some point before day 30, because you dad come home, and if you do not do it you block maria quest forever.
Perhaps now i remember bad some thing. So i really need help damn XD
I really like this new update, Maria sister is to damn hot! I hope to see her again with lot of fucking time.
Also maria quest is a rushed one if you do it at the start, because the sex time with her sister seems to much an advanced sex thing XD
The other woman with Maria is ofc the one that in the old version you can spee in the bathroom at maria work.
Surelly other two woman that the autor milk for money XD