Only 30.6 percent achieve a GCSE strong pass — Grade 5 or above — in both English and math, compared with 48.3 percent of children with no special educational needs, BBC reported.
And 57 percent fail to reach expected levels in reading, writing and math in SATs — a standardized test widely used for college admissions — tests at the end of primary, compared with 26 percent of children with no special educational needs (SEN).
The NDCS urges more government funding.
Its analysis of government data suggests the average Attainment 8 score (how well pupils do across eight core subjects) for deaf children was 39.2 — but for those with no SEN, the average was 49.8.