Traveling with a smaller party? Don't bother with Training Projects!
No Pain, Sick Gains!
Players who want their characters to level up faster have probably familiarized themselves by now with the smaller party system. That is to say that setting your XP to only active party members, and traveling with 5 or less people grants you more XP than traveling with all 6, or having inactive party members on.
Unfortunately, this comes at the cost of your inactive party members falling behind in levels, which the Kingdom Management option tries to counteract with "training" projects designed to boost their levels to something appropriate.
I am here to tell you now that these projects are a SCAM! Meant to trick foolish little monarchs into throwing away valuable BP on their terribly pre-built servants.
First of all, the training missions have a pre-set level for each chapter, and seem to cap out somewhere around level 12 by the end of the game. Any leveling beyond that point needs to be done through manual experience...
Or does it!?
As it turns out, reaching the House at the Edge of Time will automatically bump ALL your companions up to whatever level your main character is. So even if they've been sitting around the capital doing absolutely nothing the entire game, your companions can jump from level 1 to level 20 in the blink of an eye!
This means you can save all that BP you were going to spend on their "education" and put it towards something more productive; like a Troll Den, so that your Barbarian Arena can put on a good show for the masses!
As a side note, it is probably worth mentioning that the XP you get from quests and kills is divided evenly among everyone in the group. A party of 5 will level faster than a party of 6. A party of 4 will level faster than a party of 5. A party of 3 levels faster than a party of 4, est.
For best results, traveling solo will level you up faster than any legitimate method (as in no downloading cheat programs). This will cause ALL the delicious experience points gained from encounters and completed quests to funnel straight into one character, your main character, as a matter of fact.
If you've got the skills or foreknowledge of how to run a solo game, you can try to achieve level 20 by yourself, then wait for the end game to build the party who will help you take down the final boss and claim all the credit for your hard work!