Hello.
What comes around goes around, dear ZOS.
There is a way to fast farm levels. The only place where low level character can fight vs veteran monsters is Cyrodiil. On level 10 each guard give you ~1.5% XP and you need to kill ~70 of them to level up. However, you can grind on them to level 50, because XP is increasing with your level. On level 49 you still get ~1% XP and you need to kill only ~140 guards to level up. That's not a huge difference. There is one great place, where guards spawn 15s after you kill them - guards on gate. There are 16 guards, so killing all guards = 20% LEVEL ON LEVEL 10 OR 10% ON LEVEL 49! If you clear guards twice per minute, you get 40% of level every minute on level 10 OR 20% of level every minute on level 49.
This way, it's possible to level up your alt level 10 to veteran 1 in 3 hours. You will, of course, need someone help to clear guards. You can just go afk and use skill every 10 minutes to prevent kick due to afk. Soon, I will post instructions how to enter powerful mode and one shot guards, so it will be possible to level up your character even faster!
Enjoy!