Nicola Sturgeon and Tim Farron faced a grilling from a Question Time audience in Edinburgh yesterday evening.
Liberal Democrat leader Farron ruled out joining any other party in a coalition, and said the Conservatives are heading for a "landslide" victory in the General Election on Thursday.
Questioned on polls, which suggest his party will struggle to build on their nine seats, Mr Farron insisted they should not be written off.
Nicola Sturgeon faced a call to resign from one member of the BBC Question Time audience, who attacked her record on education, claiming the country is now the "worst" in Britain and accusing the SNP leader of making "misjudgments" around tuition fees.
Scotland has slipped down the Pisa international education rankings with the most recent report in December Scotland's worst since devolution, recording falls in reading, maths and science in secondary school pupils.
Ms Sturgeon said she expects to be "judged" on her education pledge at the next Holyrood election, arguing her party was taking action.