The table shows the number of students with the following scores. A lower score means a better performance. Prizes were given to the top 4 students. Julian won a prize. What was the highest he could have scored?
Score | 13 | 14 | 16 | 18 | 21 | 24 | 25 |
Students | 1 | 3 | 2 | 8 | 5 | 3 | 1 |