Freshman Going to Sophomore Year

OK, so here is the situation… I have a 2.64 cumulative GPA… I am only a freshman in high school and I am going to do whatever it takes to make that at least a 3.3 by Junior year. What is the maximum GPA I can get by the end of my Junior year?? Also, what are my chances of going to UMD? I have decent EC’s (Boy Scouts, Cultural Groups, 1 Varsity Sport, and Leadership).

I am sure you should be able to do the GPA math on your own. I can tell you my stats when I got into UMD: 3.5 UW GPA, 1950SAT. I graduated high school 3 years ago.