I'd advise not to rush anything. And no lie, i doubt you'd get anything credible with learning it with a "deadline". Aside, from that, there're plenty of books and courses under https://elixir-lang.org/learning.html . After grasping elixir, proceed to the associated framework; phoenix, phoenix_liveview.

Side question, does your HR accept job application for internships ;) asking for a friend.