1) Not typically, but 5% of offers are done through a process called principals discretion which does require an application and interview. There are resources and workshops you can do to build confidence for the interview tho so don't stress about it
2) It really depends. Ik people who got in without any tutoring and people who didn't get in with tutoring it rlly depends. If you want to build confidence i'd personally do tutoring I'd just find a place close to you that has a good reputation and satisfies ur needs.
3) I honestly don't know. there's probably something for it in year 11/12. In year 9 there was no coding stuff. In yr 10 you can do info tech??? Idk if that's the kind of thing ur talking about tho