If you revise the way you think about something, you adjust your thoughts, usually in order to make them better or more suited to how things are.
He soon came to revise his opinion of the profession.
If you revise a price, amount, or estimate, you change it to make it more fair, realistic, or accurate.
They realised that some of their prices were higher than their competitors' and revised prices accordingly...
The United Nations has been forced to revise its estimates of population growth upwards.
When you revise an article, a book, a law, or a piece of music, you change it in order to improve it, make it more modern, or make it more suitable for a particular purpose.
Three editors handled the work of revising the articles for publication...
The staff should work together to revise the school curriculum.
When you revise for an examination, you read things again and make notes in order to be prepared for the examination.
I have to revise for maths...
I'd better skip the party and stay at home to revise.