How many prep tests?

Hi all, I am registered for the April 2022 LSAT and started working through the core curriculum in mid October. I work 40-50 hours a week for a bank's legal department and I am only able to study for about 18-20 hours a week. According to 7Sage's study schedule I will not complete everything, including all of the prep tests, until next October if I am studying for 18 hours a week. My plan is to complete the core curriculum and then do 2-3 prep tests per week from there and get through however many I am able to complete between when I am done with the core curriculum and the real test, but I know I will not be able to complete all of them. Once I'm ready for prep tests, should I start from newer ones and work my way back towards older ones so that I'm working on tests that are (I'm assuming) more similar to the test I will take? Or oldest to newest? Or maybe start somewhere in the middle? Any advice is appreciated!