some experience with SAT and AP. My sister and I got in top schools in US.
SAT - I had 1300 but i had strong portfolio i.e. president for several academic societies. started some university course from Grade 11 etc.
If your child is planning for Ivy league, you will need to get 5 in at least 2 subjects in Grade11. Since college application around dec, your Grade12 AP grade (release in may the next year) will not help you much in college application.
SAT 幾多分先至夠好?視乎你考邊間大學,睇吓大學公佈的common data set, 參考收生的資料就知幾多分係average.
Eg. UCLA
SAT Math
715 average
630-790 range of middle 50%
SAT EBRW
690 average
640-740 range of middle 50%