My response is bascially the same as everyone elses The need for a tutor really depends on the individual. If they play games at home instead of doing homework then they're better off with a tutor as it forces them to do work; whereas on the other hand, if you can do more work at home then in a group environment then stay at home!
I'm against tutoring, and I hate my parents for forcing me to go from Year 7 to half of Year 12. Their concept, like of many Asian parents, is flawed; they believe in "the more tutoring you go to, the higher UAI you would get; and without tutor, you would fail"; and from my experience, I've been getting decent marks without the need of a tutor. The only good thing I can think of having a tutor is that they provide you with resources such as past papers. Then again, you can always download them online and print them off yourself
So my advice, try going without a tutor first. If you get decent marks then good! If not, then either push yourself further and harder, or get a tutor to help you