Great idea to retake previous practice tests to confirm understanding and mastery.
You can also use psat practice tests if you run out of sat practice tests. They will be easier but may still be helpful l.
Last ditch — you can still use free act practice tests to practice English and math. Don’t bother with the science. It won’t be the same as sat but it has to be at roughly the same level because scores from both are equally accepted by the colleges.
But start with official sat practice tests