Gamification

As the student progresses, they can reach levels of competency and be awarded a certificate they can show to their family, employers.

Could the certificate be advertised as Oxford University or "Oxford Recognised" level of English Proficiency based on the Oxford list of Vocabulary.

As Oxford has defined the 3000 words required for english proficiency or at least high school level proficiency, our levels could build up to this target of 3000 words.

so first 100, 500, 1000, 1500, 2000, 2500,3000 words

and beyond that to 4500 words for college level English proficiency.