Seventy-six of the professional staff have master's degrees and five have their doctorates. Grading Policy Irving High School operates on an 18-week semester system. Some classes meet for multiple periods. Seniors are required to take a minimum of six of the eight periods offered. Numerical grades are given at the end of each six-week grading period.
Course credit is awarded at the end of the year and is based on the final course average.
An average for a full year course is determined by averaging the two semester grades. A weighted system of awarding grade points is used to reflect the differences in the difficulty of course level. No grade points are awarded for this grade. North Lake provides college student tutors to assist in 9th and 10th grade teaming classes and ESL math and reading classes. In addition, two North Lake College ESL teachers co-teach in science and English classes.