To level up faster 1 to 9 Kill normal mobs (With the weaps u get at start killing mobs with 1 or 2 hits is way faster than doing quests), go walking and killing mobs from start until aldelle village (Asmodians) then take fly transporter and go anturoon crossing and kill mobs again until you reach lvl 9 ( go ishalgen prison camp, mobs are lvl 8 and 9)
Make the last campaing quest
After that go Altgard/verteron and make quests until lvl16, campaing quest and normal quests, at lvl 16 enter haramel, and re-enter until level 20-21, when you reach those levels make stigma quest and go Morheim/Eltnen, and continue with quests (Now here because of the experience from quests) until level 25.
When you reach level 25 get a group or invite a friend and enter in Notchsana training camp and clean fully in solo, you should be able to level like this and reach atleast level 30,
after that if you are able to do it, solo or duo fire temple until level 35, if not, make quests in morheim until level 35, when you reach level 35 solo Alquimia research centre or azoturan fortres for elyos, alquimia is way easier and you should be able to fully clean it in solo and reach atleast level 39, then you can make kromede's trial and reach level 40, at level 40 solo duo steel rake and continue making kromede's trial and alquimia research center until 45, at level 45 make campaing quest from brusthonin and when you finish them just solo or duo adma stronghold until level 50 or 51, whatever your prefer, then make quest to reach gelkmaros, at the time you reach gelkmaros you can make quests to reach lvl 52 and half or enter udas temple and lower udas temple in solo or duo until level 53, if you leveled until 52 and half, just make greater stigma opening quest and you should reach level 53 if you make campaing quest at same time, then there are two ways, Solo or duo beshmundir temple or making repeteable mithril coin quest, with thos two ways you should be able to reach level 62 or 63 easy, (Beshmundir is way faster), at time you reach level 62 or 63 just make Katalam and Danaria camps weeklys and normal quests, at time you make campaing quests, then you should reach atleast level 64 and half or 65, if you didn't reach level 65 yet, you can finish leveling part with the mithril coin quest again, is way bored but effective, i leveled up a character form 51 to 65 in two days playing like 5h per day, wichs are 10h to level 14levels +-, and that should be all