SAT Writing and Language

So i am a senior and i just screwed up my last chance on the ACT for most of my college selection (26C, 27Superscore).
I might try to tackle the SAT but i’m not sure how it works with scales and scores. I just took my first Writing and Language test on a practice one. i missed 9 so 35/44 (no empty aswers). What score would that be and can you send an ACT conversion. I’m aiming for an equivalent of 31 for some ivy-leagues. Tell me if i have a good start, I might sign up for it tomorrow and get to work