Depending on your household income, in the 2021 to 2022 academic year you could get between £50 and £1,821 a year.
The rules aren't documented on gov.uk:
After you apply you’ll get a letter telling you how much you can get.
https://www.gov.uk/parents-learning-allowance/how-to-claim
The rules aren't documented on gov.uk:
https://www.gov.uk/parents-learning-allowance/how-to-claim