Chances of getting into UT Austin

I’m a junior and I’m in the top 8% of my class
I’m a second semester freshmen
Have college credit for Spanish, Gov, and Econ
Playing tennis and one some art contest
Have a 1500 on my SAT

Can I get into the natural science department I have been taking rigorous science classes like honors Chemistry and Biology, and AP Chemistry?
What can I do to get a higher chance

I think you have a good chance. Apply as early as possible once the application opens up.