High school marks and MEXT ( undergrad)

[willingo]

Hello I live in Canada and am going to apply for mext ( im in grade 11 ) in my 12 year,now, Im studying ahead for physics chem and math, so I cando well on the exam. Does anyone know how much they look at your highschool marks and how much they will take it into consideration. Because im in grade 11 right now and my average isnt super amazing or anything, its around 85 86, so its good but its not like the best of the best. However I am very confident that im going to beast the exam because ive been studying ahead and the syllabus for a couple months for the exam. Just wondering how much they will take your marks into consideration. Also I got owned in grade 9 and 10, 70's in pretty much everything so I dont know if this will make a difference.