There's probably not much you'll need to change about your studies since the LSAT-Flex will feature all and only the types of subject matter and questions that you'd encounter on a regular LSAT. The only substantial change is that Logical Reasoning has lost its status as the most important section, since it's now worth just a third of your score, rather than half. You should probably, therefore, increase your practice on Logic Games and Reading Comp and decrease your practice on Logical Reasoning.