Reporting trimester grades?

<p>Hello all,
I am in the process of reporting my G9 grades. All but three classes were on a two semesters system. My three art classes rotated throughout the year and were on a trimester system. So for the first one third of the year, I had Drama, then the second third I had Music, then lastly I had Visual Arts. How should I report these trimester grades when everything else was in semesters? Should I do it this way? (I will just use A+ as a random grade inputed)</p>

<p>Course Name------S1--------S2
Drama-------------A±-------NO
Music--------------NO---------A+
Visual Arts--------NO---------A+</p>

<p>Help much appreciated!</p>