Very doable! If you've been averaging the high 90s in Unit 1/2 that's a great start. Focus on understanding all the concepts as comprehensively as you can start of the year, and apply them in a lot of practice test and exams as you go throughout the year.
Generally, you can afford to lose about 8 marks in total, so quite reasonable margin of error!
VCE 2021: 99.90 ATAR
Monash Medical School Class of 2026
RAW 50 MM & SM Exam Prep Resources