The reason you do not see new students who have been imported into Gradelink from EnrollMe is because all new enrollments first show up under the New Enrollments list in the Students tab. They will become part of  the regular list of students when you promote students to the next grade level at the end of the school year. 

If you need to manually make them active before that time:
1. Go to the Students tab
2. Click the All Active drop-down menu at the top of the page
3. Select New Enrollments
4. Select a student
5. Change their status to Active
6. Click the Save button at the bottom of the page.