I just don't get the obsession with 600 points. OP hasn't even done the actual JC yet. He/she is going by JC MOCK results that he/she is able to get 600 points in the LC. JC is a cakewalk compared to LC and the JC course is a drop in the sea compared to LC course especially with an extra subject on the side.
To get an A1, in any subject you have to know the course to the bones and not allow yourself to make any mistakes, naturally. Let's see.
English H - 4.3% of students got an A1 in this last year. Are you pretty certain that you fit into the 4.3% part?
Accounting H - 9.5% of students got an A1 in this.
Geography H - 3% of students got A1 last year.
French H - 5.7% of students got A1 last year.
Physics H - 8.9% of students got an A1 in 2011.
Economics H - 3.6% got an A1.
So roughly, do you consider yourself to be in the top 5% of the students in the country?
It's nice to have set up yourself a target of 600 in 3rd year and all that but you seem to be very particular about it. I fear you will become very disillusioned by the time you're doing your mocks in 6th year about the 600 points business.
And if you hate science now, you certainly not gonna like it for LC, so an A1 in Physics seems a bit out of reach.
P.S. Writing about getting an A1 in English while using 'you're' instead of 'your', 'chose' instead of 'choose' was bound to get some funny retorts.