The Health Science First Year (HSFY) course is very competitive - there are around 140 spots in medicine annually. For those who are coming through the HSFY pathway, which typically gets upwards of 1600-2000 students, most of whom are trying to gain entry to medicine.
Having said that, it is entirely achievable to succeed with the right dedication and support. Start preparing early, especially for UMAT which counts for a significant proportion of the admission criteria - and when compared to a standard paper is worth around 3.47x as much for a 3-hour exam (same as each of the papers).
Also regarding some more general advice, I would recommend being careful with which UMAT resources you use as there are many shady ones out there!
Hope this is helpful! Let us know if you have anymore questions