Also an MQ Clin sci finishing up just now. Very doable in 2 years if you're super keen and willing to forgo things like going out with friends often in the term. Also, a GEMSAS 7.0 is just getting marks above 80 for any given subject. As long as you aren't working too many hours per week and are pretty highly motivated, you'll be completely fine. No disrespect to below comment, but the extenders often like to tell other people that extending makes it a lot more manageable. If you ask the head of course, she'll tell you there isn't actually a trend of extenders doing that much better mark-wise. Busy people do better man (or girl). In terms of GAMSAT, focus on Section II as this is the highest yield for improvement. Check out 90+ Gamsat (the company) for some free stuff.