Conditional trigger in SQL Server

Create TRIGGER trg_Student_Monitoring ON Categories AFTER UPDATE AS

IF (select COUNT(name) from students s, deleted d where s.studentId = d.studentID and s.categoryId = 4 )>=1
Begin
      INSERT INTO Students_Temp(StudentID, StudentNAME,  StudentCategory)
      SELECT  I.StudentID, I.StudentNAME,  I.StudentCategory FROM INSERTED I
End