It would be very inaccurate to suggest to you a 'mark' or 'rank' which you should achieve in order to obtain your desired ATAR of 95+. This is due to a few reasons. Firstly, every cohort/year has different students of different abilities, so your cohort could be exceptionally good or also, on the other side of the scale. Also, some subjects may not have the calibre of students as some others may. For example, Subject A may have all of the top 10 students (based on aggregate calculations), whereas Subject B may have none of the top 20 students. This would mean that achieving a rank of 6th in Subject A, may still be better than 1st rank in Subject B.*
I would suggest that you should be in the top 3 in a majority of your classes except for extension english OR subjects which have a large amount of people. E.g English and Maths.
In summary, use your own discretion based on the information above AND your own information which you have about your school in order to determine what ranks/marks you should be obtaining.
*N.B. This does not take into consideration that certain students may be skilled/gifted in some subjects and not others