Online English Teaching Quality Assessment Based on K-Means and Improved SSD Algorithm

Table 2

Grade evaluation form.

Grade	Grade description
A+	The proportion of students who listen carefully and actively participate in the classroom accounts for more than 75% of the total number of students in the classroom.
A	The overall classroom status is close to the A+ level, accounting for more than 70% of the total number, indicating that the whole classroom is good.
B+	The overall classroom state is close to grade A. Most (>67%) students are in the state of recognizing B+ listening to the class. Only a few students are not serious and can communicate with students after class.
B	A small number of students in the classroom do not listen carefully and cannot actively participate in class B. However, on the whole, the number of serious students (>65%) is still greater than the number of careless students.
B−	The number of students who do not listen carefully and actively participate in the classroom exceeds half of the total number of students in the whole classroom (>45%), indicating that the effect of the whole classroom is not ideal.
C	There are too many students (>C50%) who do not listen carefully and do not actively participate in the classroom.
C−	There are many problems in the classroom. We should find out the root problems in time and make corresponding adjustments.