The two week NCBO is taken with both STEM and Non-STEM pathways. Topics in mathematics such as arithmetic operations, basic algebraic concepts and notation, geometry, and real and complex number systems. Non-transferable and does not count toward a degree at Texarkana College. Students whose TSI scores are in the following ranges: STEM (320-330 or ABE Level 3 or 4) or Non-STEM (320-325 or ABE Level 3) must take this NCBO.