Majority of schools will look at your last 60 units. So if you are truly interested in SLP, try your hardest to get a good GPA in undergrad. Because grad school is VERY competitive. I did my AA in nursing and my GPA wasn't the highest, but for my last 60 units I did much better. I got accepted into grad school, it is very tough! But so worth it, especially if you love the field. So my advice, try for best in your SLP classes, do well on the GRE, write a really awesome LOI, get good letters of recommendations, and to make yourself stand out even more try and work as a speech paraeducator in a school or observe an SLP in a hospital/skilled nursing facility/rehab center.