IF SIR LEYE IS NOT THE ONE YOU HAVE TO KILL FOR THE BRAINS TEST, THIS ANSWER IS WRONG To beat sir leye, you must be a female.
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He is easy to kill only level 20, you have to be a woman in Runescape to get to him though, my guesses your doing the recruitment Drive Quest.
Sir Vyvin can be found on the second floor of Falador castle, to the east.
look on runehq
Refer to the related link below.
You can find this guy in the West side of Varrock palace, ground floor