How to prepare for the LNAT test?Watch
And what should I be doing to prepare for the essay?
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Get a newspaper and find a column that argues for a point of view that's relatively controversial. Consider what you think on the subject. Now ask yourself how you would argue for your point of view against someone who disagrees. Write down your argument as clearly as possible.
Now read through it again and consider how your disagreeing party might take issue with what you've said. Maybe she would challenge an assumption you've made? Maybe she would say that although she agrees with your assumptions, there's something you've failed to take into account? Write out your argument again, but addressing these possible challenges as you go.
When you're convinced there's nothing you can add to clarify your argument or make it any more convincing, see how long it is. If it's over the LNAT word limit, consider how you might express any of your points more concisely. (You may not be able to, in which case some of your points would just have to go in the LNAT.)
When you've done that, pick another article and start again.