University Applications

Hii so I'm currently a JC student, and I was wondering if for university applications they require your exact numerical grade or just the 'A' 'B' 'C' kind of grade. I.e. is there a point in spending my time gunning for a 90%+ kind of 'A' or is it the same as if I just get a "barely scraped past 70%" kind of A?

I realise it's ideal to just try your best, but at this point of time I'm taking up a lot of different commitments to try to build up my extracurricular portfolio as well so I just want to know how much time I should spend on this.