Your unit 1/2 subjects do not count for anything, so long as you "pass" at least 16 units. Let me clarify the process for you on how the ATAR is calculated:
1) You complete unit 3/4 subjects and you are given a "raw study score" for each subject, which is a whole number between 0 and 50 inclusive. The average and median score is a 30, with 9% of students scoring a 40 or higher. So basically, your performance is compared against the rest of the state and they try to find out how well you did in that subject compared to everyone else in that subject.
2) Your subjects are then scaled to give you a "scaled study score". A difficult subject that has a lot of high-achievers in it (such as specialist maths) will get scaled up, since you are competing against much brighter people, making it harder to get a good raw score. An easy subject with a lot of low-performing students (such as food tech) will get scaled down, since it is easier to get a good raw score in these subjects.
3) Your scaled scores are then added up. Your "primary 4" subjects (the top 4 scaled scores, with either English, Literature, English Language or ESL included in the top 4) will count for 100%. Your 5th and 6th subjects will count for 10%. Your 7th subject onwards won't count for anything. Once this has been added up, you will be given an "aggregate".
4) Your aggregate is compared against the rest of the state. If your aggregate is in the top 0.05% of students in the state, you will get a 99.95 ATAR. If your aggregate is in the top 0.1% but not the top 0.05%, then you will get a 99.90 ATAR, and so on.
Now, the difficult thing is: you've told us what your scores are for unit 1/2, but all of the assessments you've done are internal. You haven't done any external assessments (such as a unit 3 or unit 4 exam). We don't know how difficult your assessments are or how generous your teachers are with handing out marks. A 90% in one school might be equal to a 30% in another school, if the latter has much more difficult tests and exams. There is also the chance that your marks might be very different in year 12 compared to year 11. Some students put in a lot more effort during year 12, whilst other students crack under pressure and their performance decreases.
All I will say is: a 90 ATAR might seem daunting, but it is a very achievable goal for someone who is motivated to do well in VCE. If you study regularly, stay organised and keep up to date in all your subjects, then you will have a good chance of getting in the 90's. Good luck!
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