taking care of business

suggestions please!
What is the most effective way of getting things done?
I just made a list of everything I need to do for school and I'm trying to figure how to get it done best.
Step one: turn off phone.
Step two: close door
Step three: buckle down and DO THE WORK! don't let anything distract from what is important to get done.
Step four: Mantra- "you'll feel better when this is all done."

But does it work better to multitask, or get one thing done at a time?
Does it work to have scheduled breaks?
Do I get the hard stuff done first? Or do I get the easy stuff out of the way so I'm not thinking about it anymore?
What do I do?