Gap Year Savings Before Med School - Roth IRA, Emergency Fund, or Stay Liquid?

Hi everyone, I will be starting medical school this year at a U.S. M.D. program and am currently deciding between a few acceptances. I plan to attend the most cost-effective option and will be financing school primarily through federal and private loans. During my gap year, I have been working part-time as a medical assistant and will likely have saved somewhere in the range of $10,000–$15,000 by the time I matriculate. I have done some modest travel this year and have one more trip planned before school begins, but I expect that amount to remain after expenses. I have been reading *The White Coat Investor* books and trying to build a solid financial foundation before starting school. I am now trying to decide what to do with these savings: * Keep it fully liquid as an emergency fund during medical school? * Max out a Roth IRA (assuming eligibility) and keep the rest in cash? * Invest some portion in a broad index fund? * Hold everything in a high-yield savings account? * Some combination of the above? Given that I will soon transition to a loan-funded lifestyle with minimal earned income, I am unsure how aggressively I should invest versus preserve liquidity. For those who have been in a similar position, what did you do and what would you recommend in hindsight? Thank you in advance for your insight.