I started working on this trainer, which is an improved version of the one Dharbert released yesterday. It has the potential to award 76k EXP in a single match from challenges alone. There are many more challenges that could be used, but I lost all will to continue searching for addresses after I read that multiple people had been banned for using a similar hack. I'm releasing it in its current state for those that wish to use this. BUT BE WARNED! This tool HAS been linked with TAC/VAC bans. This may be down to misuse (such as leaving the trainer open/using the hack to edit memory within the lobby/game).
Instructions for use: Download the hack, open BO2 (Best to use this tool within the barracks), run as administrator, and press your desired hotkeys (1-0 and Q-O). CLOSE this hack, enter into a game, complete the following list of challenges (most of them will be achieved through general play), and enjoy your EXP. After every game, you must exit the lobby, return to the barracks, run the hack again, close and repeat. You should level up pretty quickly.
Other Information: This hack was intended for use by only myself. Therefore, it is specific to my class. If you wish to get the most out of this, you should run the perks hardline, toughness and Dexterity, with the killstreaks of UAV and counter-UAV.
Credit to Dharbert for both the idea & finding of multiple addresses.
You have my permission to share, modify and re-release this tool with any modifications that you see fit.
List of included challenges can be found in a text file alongside the download.