Here is link to find out what UT credit you can get for what SAT /SAT II / ACT /AP /IB /CLEP test.
http://learningsciences.utexas.edu/studenttesting/exams
This page also has information about UT tests, for example additional test for AP Government (Texas part) or foreign language tests if you want to test out from foreign language requirements (you are bilingual or native speaker of foreign language or just speak foreign language very well but never took any test).
These tests are important to plan what classes to register for, but you need to discuss it with your advisor during summer orientation - if you want to claim credit, claim placement, or repeat the class, especially Math when you already have your ALEKS scores.
Also, it doesn’t matter how many AP /IB credits you can claim, You will start Fall 2016 as freshman. And you will register for Spring 2017 classes as freshman. Your status will change to sophomore or junior in February 2017. Also, even if you send all scores during this summer and UT will have them on file, you will be able to claim credit any time during your studies, It is probably wise to wait with AP credits that you don’t need for your degree which will count as electives. You can decide later if you want these electives or something else from UT more related to your major. This can be also discussed during summer orientation.