Lower grades refer to the academic scores achieved by students that are lower than average or below grade-level expectations. Synonyms for the term include poor grades, low marks, substandard scores, unsatisfactory achievement, inadequate results, and deficient grades. These synonyms are often used to describe a student's academic performance, which can be influenced by many factors, including the quality of teaching, learning materials, student motivation, and parent involvement. It is important to identify students who are struggling academically and provide them with appropriate support and resources to help them improve their grades and achieve academic success.