Labour leader Sir Keir Starmer will pledge to break down class barriers to opportunity, in a speech outlining his party's plans for education reform.
Sir Keir is expected to warn the "class ceiling" is stifling opportunity for too many children across the country.
He is due to unveil a new goal of half a million more children reaching their early learning targets by 2030.
The target is part of the party's education shake-up and the last of Sir Keir's five missions.
Speaking to BBC Breakfast before Thursday morning's speech in Gillingham, Kent, he said he wanted to remove "barriers to opportunity".
He said his aim was to break the link between "where people start in life as children and young people, and where they end up".
Part of the plans include removing tax breaks for private schools, which he said would raise £1bn - funds that he would use to employ 6,500 more teachers in areas with shortages.
Today's speech is also expected to include a retention policy, a focus on language skills, as well as a look at the curriculum to make sure "there's an emphasis on art and creative subjects".
