As far as anyone knows
To the limits of anyone’s knowledge
- The party is at Sarah's house as far as I know.
Can’t make heads or tails of
Failing to understand or confused about something
- I can't make heads or tail of these instructions on the packet.
Doing one's homework
A large collection of a particular of thing
- It was obvious that she had done her homework and thoroughly prepared for her interview.
Know something backwards and forwards
To be an expert or intimately familiar with something
- She knows her part in the play backwards and forwards.
Knowledge is power
The more someone knows, the more equipped that person is
- Knowledge is power and health is wealth.
Pick one's brain
To obtain ideas or information from someone
- I was picking Simon's brains about which computer to buy.
Pull an all-nighter
Used by students to indicate late night/all night studies
- I pulled an all-nighter last night.
To the best of your knowledge
As far as you know
- To the best of my knowledge, the chemicals which were found are not dangerous.
Under one’s belt
Safely or satisfactorily achieved, experiences, or acquired
- Basic computer skills are a good thing to have under your belt.