Requesting multiple scripts if possible

[KyleEzra]

Hello and good day rAthena members and staffs, I would like to request some script for my server
coz i don't know how to script the following. For the #1 request, i tried some scripts there but it end up failed and
the #2 its embarrassing that i don't know how to script that one even though i know some basic scripting

1) Custom item script (EXP Boost)
    Script that if you use a equipment it has a 1% chance to gain 15% exp boost (like field of manual) for 10 minutes
    if the player killed a level 75 or higher level of monster

2) On Base Level-up Event
    Prevent level-up progress of a player if the player did not meet the specific requirement
    (if the player level 99 is going to 100, the script will prevent the player from going to level 100 if it
    does not meet the required kills of monster: ex. Level 100 Requirement is the following: Kill 200 monsters which level is 80 or above
    and the display of requirement and monster killed counter is at the bottom the "regular chat box log")

Anyone can help me? thank you.