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Students think that chemistry was a difficult subject. Students’ learning achievement influence of several factors. Critical thinking skills can influence the students’ learning achievement. This research aims to identify the critical thinking skills of tenthgrade students. They are high, medium, and low critical thinking skills that can be identified using the Cornell Critical Thinking Test (CCTT). Survey method as the research method. The data was collected by the test in three schools with high, medium, and low grades. The result showed that there were 35.5% with high critical thinking skills, 45.2% with medium critical thinking skills, and 19.3% with low critical thinking skills (high grade school); 25% with high critical thinking skills, 56.25% with medium critical thinking skills and 18.75% with low critical thinking skills (medium grade school); 18.75% with high critical thinking skills, 37.5% with medium critical thinking skills and 43.75% with low critical thinking skills (low grade school). This research can be used as a reference to improve students’ critical thinking skills.

Critical Thinking Skills of 10th Grade Students and the Effect on Learning Achievement