What proportion of the poorest 20% of the population will benefit from the abolition of the graduate endowment payment.

This information is not available. Under the provisions of the Graduate Endowment Abolition (Scotland) Bill, Scottish ministers will report to Parliament on the proportion of the poorest 20% of the population who will benefit from the abolition of the graduate endowment fee in future years.
Liability for the original graduate endowment fee was not means-tested and so young people from the poorest 20% of the population who are at university and are liable for Graduate Endowment fee will no longer need to pay and will therefore benefit from its abolition.