If you review a document, it means you read it and examine it (and maybe have some ideas to improve it) - but you don't make any changes.

If you revise a document, it means you change the text to correct errors or make improvements.

When preparing for a test, it's a good idea to study the material again in order to refresh your memory. American English speakers say you are reviewing for the test. British English speakers say you are revising for the test.

Fact
At more then 10,000-years-old, a coniferous tree, on the island of tasmania, is the oldest known living organism. It has lived through the cultural development of mankind and magestically covers an area as large as a city block.      .. More >>