Leveling up all your classes in Aliens: Fireteam Elite 2 will require you to complete most of the missions more than once. The XP gains are quite small at the standard difficulty level, and that's why using challenge cards is strongly recommended. However, despite a potential x3 XP gain from challenge cards, they provide such an upscaled difficulty that you might fail and waste your time, which is why we'll explain what you need to do to get XP quickly in Aliens: Fireteam Elite 2!
After you unlock the challenge cards, you will be able to boost your XP gain. But while you have not unlocked it, try to use your sidearm during the mission as much as possible to increase its level and unlock its Augment slot.
Once challenge cards are unlocked, speak with Wrench at the base and buy the "Tools of the Trade" challenge card. This card will remove access to your primary and secondary weapons, forcing you to only use your sidearm during the mission. In exchange for that, your XP will have a x2.5 multiplier.
While it may sound difficult in the beginning, the sidearm actually deals a decent amount of damage if you buy some attachments for it. Also, when you play solo, the AI teammates perform pretty well on the standard difficulty level. So, as long as you keep them alive, you should be able to finish the missions without a problem with your pistol. Since you always get infinite ammo for the sidearm, you won't have a problem with ammo management either.
Playing as a Medic is strongly recommended here, as it will give you the tools to heal your AI teammates and keep them alive in the intense battles. However, there are a few missions that we suggest you avoid trying to complete with the Tools of the Trade challenge, including Deadly Descendants, Queen Fight, and Canyon Crawlers. Not that you can't complete them with a pistol, but it's just way too difficult. Usually, Xenomorphs are easier to kill with a pistol compared to Security Synthetics.
Normally, you get around 6,000 XP for completing a mission at the standard difficulty level without any challenge cards, but using the Tools of the Trade challenge card raises the XP gained to nearly 15,000 XP.
Your next option to further increase the XP gain is to equip the Veteran Marine perk. This increases your XP gain by 20%. If you reach the max rank for any class, you will also unlock a veteran perk of that specific class, which adds an extra 10% to the final XP gain. So, as you max out more classes, your total XP gain rate increases even more by equipping different variants of the veteran perks.
Last but not least, if Tools of the Trade seems like a difficult option for you, the other easy challenge cards that you can go for are Travel Light (1.5x rewards), No Plan A (1.5x rewards), Primary Weapons Only (2x rewards), and Slow But Sure (1.75x rewards).
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