I went to a lot of them actually...I went in yr. 11 when I was considering doing 4u as well as in yr. 12. I think they are very worthwhile, you get told a lot of things that you may not know, and what you do know is confirmed for you. That way there is no doubt in your mind about whether you're doing things right. Basically the day tells you if you're heading in the right direction, and it's really good to go because if you're not you still have time to fix the things that need fixing etc. I think they are worth the money and very worthwile...so I recommend you go, it really helped me with my major work.