A proficency level tells you what your child can do with English.  The proficiency levels go from Level 1, the lowest level, to Level 6, the level of a native English speaker. 
 
Your child has English proficency levels for 5 different areas:  listening, speaking, reading, writing and an overall proficiency level.
 
As your child learns more English his/her proficiency levels will change.  In order to exit the ESL program, your child must have an overal profiency level of ____ with at least a Level 4 in reading and in writing.
 
The link below provides a description of each of the English proficiency levels.