As part of a series of tests to measure mastery of specific skills in the natural sciences, copies of tests 27 through 38 include: (27) reading a grid plan; (28) identifying common invertebrates; (29) characteristics of invertebrates; (30) identifying elements; (31) using scientific notation part I; (32) classifying minerals; (33) predicting the activity of metals; (34) interpreting ticker tapes; (35-36) predicting direction in a magnetic field 1 and 2; (37) dividing in scientific notation; and (38) using Ohm's law 2. The multiple choice questions were written for students in grades 7 to 10. Teachers' notes and scoring information are provided for each test. (CM)