I would only get a tutor of you really need one, thats the way I work. I got one for English (about 3 weeks ago) because I sucked at English (and arguably still do) and felt I really needed a bit of help.
I am totally against the people who just blindly get a tutor for everything possible (ie. at least 60% of MHS), because they never learn how to learn without getting spoon-fed answers to homework and SACs, and there is no spoon-feeding in a VCAA exam.
To address:
I am a good student who understands concepts, and am slightly weaker in Math than Sciences, I am very good at English but do not enjoy writing essays. I am in year 11 and have never had a tutor.
You probably don't need one then. A good student at MHS *generally* means a 97+ ATAR if things continue in a similar fashion.
To address:
I am a good student who understands concepts, and am slightly weaker in Math than Sciences, I am very good at English but do not enjoy writing essays. I am in year 11 and have never had a tutor.
If you already think you are good at English, then its not an issue. If you are only 'slightly' weaker in Maths and Science (your weak is aiming for 'only' 45-48+ in those areas anyway...), then really don't bother.
I like revision lectures as they help to refresh memories, or even sometimes teach you new ways of looking at concepts.