I reached max level and tried to discard my exp cards however it simply is impossible to do so once you reached max level, I tried to use them but that is also impossible for the same reason. Is there any way to fix that ?
Wait for IMC to release Rank 9 to use them 
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Why would you want to discard EXP cards Oo?
Their weight 0 and don’t clog up your inventory, because there’s the maximum amount of 14 different cards (Lv 1 - Lv14).
At Rank 9 you’ll want as many cards as possible to get the next 15 Class levels…
be happy you cant drop them and be patient…
like Delatour said, rank 9 will give you an opportunity to use them…
if you could drop them you would complain about why you can drop them and then not having cards for R9
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