The overall literacy rate for those aged 10 and over was 95.7% but amongst those living in the estate sector it was only 86.1%. Of the 18,615,577 aged 5 or over, 499,563 (2.7%) had received a higher education qualification, 2,293,841 (12.3%) had passed GCE Advanced Level in Sri Lanka, 3,159,402 (17.0%) had passed GCE Ordinary Level in Sri Lanka and 700,419 (3.8%) had no formal schooling. The remaining 11,962,352 (64.3%) had left school with no qualifications or were currently at school.. How many different GCE levels exist in Sri Lanka?