I would not say hacking EXP by exploiting is impossible but the way you explained doesnt work.
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You have to know the source code or even a dump and its impossible to build a packet with only knowing the assm...
League of Legends is probably coded in c++ or something similar you cant get any information about parameters or even functions without lot of knowlege in dumping files.
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manipulates the experience amount, that it duplicates 4 or more times
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thats a myth lol... the gs uses an algorithm to generate the exp you will earn each game and all influenting factors are likely server side.