I can second the Test Innovators recommendation. The verbal practice questions on there were particularly helpful (my weakest area), and I thought actually more difficult than the real test. The ‘testing strategies’ for the quantitive section were helpful as well. One area for quant that didn’t show up much on Test Innovators but did on the real exam is graphing, so make sure to review that! I think there were a few questions involving parabolas/hyperbolas that I probably got wrong.
Honestly, many of the resources you get through Test Innovators can probably be found or supplemented for free online, but I thought it was a good investment nonetheless. You can take online or print out practice tests from there and receive a breakdown of what you got wrong and how you can improve for each section. I decided to take the ssat very late (got my scores back a day before application deadlines), so I was only able to study for 2-3 weeks before the exam, and Test Innovators helped me use that time efficiency and kept track of everything nicely.