Question about applying to GEM Watch
2) If the first question is correct that mean that I need to finish exams (gamsat, bmat, ukcat: depending on university) in 2020 before October as the deadline will close the application.
4) some universities require a level for the graduate medicine entrance. The thing I don’t understand is, if I have my degree in biomed (2:1 or higher) why it is necessary to present a level exams from school?
As for the last question, some want a levels some don't. They get thousands of applications and need to separate people so can really be as picky as they want. Why they want what they want is decided by individual universities so I can't really tell you. It may be worth emailing admissions at some point it you lack in any areas as they may make exceptions if you have other qualifications.
Your degree must be finalised before you begin the course. So you will have started 3rd year at the point of application. Your academic reference on your UCAS form would complete a predicted final classification to aid your application.