lock yourself in a cold, abandoned basement with a seedy halogen lamp on a desk that doesn't wobble in the centre of the otherwise empty room with no music or portable telecommunicaton devices, laptops etc..
just write notes, read them over & over again.. use highlighters 2 stimulate the mind. read read read read read.
if ur an aural learner, make up some kind of new wave gospel come folk tune to remember your maths formulae.. eg:
2 pi r, my lord... 2 pi r...
[probably more suitable during the festive season
]
if ur a visual learner-- mind maps!!
if u're a hands/kinetc learner um... im not sure for that one. maybe construct a diorama or something.. or re-enact the convention that plants need photons from the sun, co2 and water by depriving a plant of all of the above.
it all comes down to the individual.