I think a study score of 46+ is unlikely as you performed quite below average in your cohort for unit 3. If you want to get as high as possible, simply aim for as high as possible. Also keep in mind a study score of 45+ means you're top 2% of the state for that subject, which isn't an easy achievement.
I don't think it's very productive to predict what study score you will receive as well. You can't change how you performed in unit 3, so there's really no use worrying about it - just try your hardest for U4 + the exam and your score will hopefully reflect your efforts.
