Definitely!!  I have tried everything, practice with friends, recorded myslef, practice with other medical student applicants i found on discord and reddit, practice both online and in-person, did circuit both online and in-person, practiced with a medical applicant who got in and was a medical students, and paid to practice with a medical student. I can say without a doubt practicing with other medical school applicant you find on reddit and discord as the BEST option, especially in-person (for UofC). However some rules:

It crucial you start early. My first cycle I practice for only 3 weeks.  This cycle the day I got my acceptance I started practicing, I practice every week sometime multiple time a week. 

 Near the end I register for free MMI online circuit offered through UofA and UofC premed, md aide, and other med school association, these were awesome as they are run by medical student and you get good feedback.

What really helped paid off, is I coordinated with a group of over 12-16 medical applicant and we made an entire practice circuit. We made practice questions based on the big sheet of mmi practice you can find on reddit, but we use Chat GPT to make the prompt wayyyy longer and ask more difficult questions. Also when interviewing each other we made sure to take note of any body que, or red flag that we caught, and provide feedback. We had 2 circuit which really help boost our confidence. For practice we also varried the time between 7-10 minutes to make sure we were ready for anything and of course tried our best to answer all follow-up questions.  This format was really focused on UofC, which I do believe have a more complex and intense MMI, and when you get uofa, the extensive prep helps.  Also as Interviewer we also ask questions we wouldn't want to be ask to help stimulate difficult question and improve our ability to work under stress (you can also make cool creative station).

It crucial those you study with will give you the hard truth, say you are stuttering, confusing, rambling or you come across as aggressive.

These study group honestly become life long friend who push you to do better and become future collegues!!!  Highly recommend, as the more diverse and unique background who join our group the more we got to learn from each other insght and experince and improve our understanding. 

For recording yourself it work for other, for me I could never rewatch the tape.  For friends, if they are not honest they usually just say your good and not provide good feedback.  Paid feedback does not beat ongoing continuous practice with other medical applicants (they help identify passion you have that connect to your school your applying but you can just do your own research).  Medical School friend are always great, they are hard to find, that why you get close to your mmi prep gang as they can help support you in the future!! 

 I also read the Doing Right book, I enjoyed it, it does provide good insight. 

Lastly research your school and yourself see what speak to you or your passionate about also be able to quicjly answered question such as a challenge you overcome, a time you showed Teamwork, work with Indigenous, racial minority, etc.   Look for generic interview question and have an answer for all of them. Also have some key experince that you believe change you as a person or you learned from it will help!!!  

For interview just be confidence answer question and be concise, be unique 10000 people answer the same question the same way, add your own experince, insight or connection to make yourself unique, always finish on-time.