There is a 2-3 hour long preliminary test. If you have attended higher education it should not be very difficult. The "coding" part of the test might hard to understand if you have no coding experience at all, but you have very basic coding knowledge, then you can default onto your logic and/or math skills to answer them. Pretty basic multiple choice Q/As.
Afterwards there is a 15-30 minute call/interview with a member of the design team who goes over your background briefly. The call is more of a vibe check.