id love take the sats or an exam but I am not ready for the sat yet what can I do?

I am just learning algebra and onwards and my sats whant me to do algbra etc like the heart of algebra and passport to advanced maths I feel like I'm not ready The reason why I go from kindergarden revel to hight school level because I whant to go back throught anything I missed in school or anything of that, maybe because I whent from subject to subject instead of to it by the grades, I just love learning and khan academy is the best place for me even if I'm not in hight school more like college, can I stop preparing my SATs and wait till I am ready or delet this account and make a new one?