Hi 155dorcas!
1. Being in SOTA, I can safely say that the rough estimate is about...230-240?
2. Well, I think that those kind of scores are average over here but the standards might differ so it's hard to say. You don't need to pass Chinese in the usual years but when it comes to IB...yes you must pass Chinese. (Note that every year you MUST pass ARC, Visual Arts and two other subjects)
3. Yes, there will be! Albeit rather few opportunities I suppose. The only opportunity that I know as of late is the IA (Integrated Arts) Programme which allows for students to try out each art form each semester till Year 2.
4. Ooh! Impressive artworks! Really good potential you have there! However, I suggest trying out more realistic art. SOTA appreciates more realism and less cartoon-like art. Although, they will let you branch out more in the later years so don't worry. In the basic years, your grades will rely heavily on how well developed your realism is. But overall, really nice skills you've got!
P.S- Despite the long hours in SOTA, the experience is really rewarding. For around 8 hours a week, you'll be surrounded by fellow students who adore art, a really helpful and skilful teacher and opportunities to showcase your talents in usually voluntary art competitions, school gallery showcases AND...Yay, masterclasses!
If you're really passionate about your art, if you're really diligent, if you're really talented, your PSLE score won't really matter much. 
C
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RE: School Of The Arts, Singapore