The OOS admission rate for UT Austin is 8%, not to mention the OOS cost is close to $60k. To further complicate matters, UT admits to the major not the university. The McCombs School of Business is one of UT’s most popular majors which makes it even more competitive to gain admission. To illustrate, very few of the in-state auto-admits (top 6% of their high school class) get admitted into the business school at UT. Admission is only guaranteed for these students to the College of Liberal Arts.
UT’s application is very detailed, lengthy, and quite cumbersome. Based on your stats and your limited number of AP/IB courses, you would be wise to save your time and $75 application fee and focus your energy elsewhere.