pay/income/wages

  1. He is the only wage earner in his house.
    2a. People on low pay find difficult to educate their children in better school.
    2b. People on low pay find (it) difficult to educate their children in (a) better school.
    2c. People on low incomes find (it) difficult to educate their children in (a) better school.
    2d. People on low wages find (it) difficult to educate their children in (a) better school.
    Please correct all.
    Thanks.

2a/b. People on low pay find it difficult to educate their children in a better school.

2c. People on low incomes find it difficult to educate their children in a better school.

2d. People on low wages find it difficult to educate their children in a better school.

β€˜It’ and β€˜a’ are not optional.