Applying to college

Hello! I am a singaporean student studying in a JC, graduating in 2024 and receiving my A’Level results in roughly February 2025 and aiming to start university in 2025. According to many American university websites, the early decision applications opens November 1, while regular decision application opens January 5. Hence if I aim to start university, when do I start to apply- do I apply in 2024 with my school preliminary and mid year examination results and no A’Level results in order to enter university in 2025? Then do I apply as a transfer student because I am still studying in the school? Also, do I need to take the SATs and why when should I complete it by? Sorry for this long question, thank you!