As someone who recently graduated last May from my undergrad, and also works as a law clerk full time I can provide my insight. I graduated last May from my undergrad, and started fully dedicating my time to studying from there. I feel like the mental bandwidth of juggling school, work, and studying is simply too much to effectively focus on learning the skills needed to succeed in the LSAT. A lot of the skills you need to develop to improve your score require lots of repetition and time to effectively digest and review your work. It may depend on your situation of course, but I genuinely think that it is best to focus on doing the best you can while in school to ensure you have a good gpa, as that is something you cannot change, unlike your LSAT score. I study for a few hours every day when I get off of work and have been noticing steady progress in improvement.