Level 10 as a militia, whats next?

[Verore]

Just got to level 10 and I meet all the requirements for the next tier of skirmishers but I lack the class points to do so. Since I need to invest exp to level up, do I just dump all my exp into ranged/melee until I have enough points to upgrade or do I put them into support/riding? I asked ingame and people told me to save the support exp but that just makes leveling up take very long.