When to take SAT, need advice please!

Hi guys, so I'm a sophomore at a competitive big public school in the Northeast (15-20 kids to T20s). I want to know when to take the SAT.

Most people in my grade are taking July/August, but I just really want to get it over with. I could either take March or May, or delay further.

I took a practice test and got a 1460, I'm aiming for a 1540. I think I could get there because Math is easy and LA is just reading. I'd just feel good having an official score under my belt.

Any help would be great!