Will give you some hints for leveling.
Getting more exp:
1) get a leaf cat head +7, will cost you a bit 90m most likely, but gives 25% more exp on monster kills ( or when your group kills monsters )
2) get a costume googles ~15m, gives 30% more exp on monsters kills ( or when your group kills monsters )
That's 55% exp increase
3) get vip = 150% more exp and 1% exp lose on death, helps a lot. Also makes it possible to push full exp rewards instead of shared with job exp for eden ti quests. Also gives you 2 quests a day + 2 merit badges a quest = 4 merit badges.
Atm you will get more then 100% more exp for each monster kill because of this, and for quests you can get even 2x more exp with returning as you can deliver it all in exp or job whatever you want.
Some information about ti's ( your main leveling area )
1) party's only look for people in there level range, which means a level 71 is not getting invited in a party with level 100's, because party exp share isn't gona work then. 15 levels difference it works higher then that it doesn't. This means that entering low ti at level 71 is useless as your team will mostly exist out of bad players or sub level 85 players. As level 85 players will join party's with level 100's in it as it goes way faster.
It's therefore better to level on bounty boards until you are 85 and then enter low ti.
The best levels to be for ti party's are: low ti = 85, mid ti = 115, high ti = 135. But for mid and high ti going under that level is going to be fine too unlike low ti.
2) you can do 2 quests ti quests which you can accept at the same time with vip ( only 1 without vip ) both yield when you return the quest ( when you completed it ) massive amounts of exp and job exp, with vip you get 2 merit badges per quest turn in, which means 4 badges a day with vip. without vip only 1 quest and 1 badge as reward.
3) you can reset your quest cooldown by delivering a magical stone ( reset stone ) towards grasp and he will reset the cooldown so you can do the qeusts directly again and again get 4 merit badges + lots of exp out of it. This feature has a 3 hour cooldown, so with 24 hours in a day, you can practically get 8 + 1 free for the day = 9 turnins if you obviously don't sleep.
4) magical stones ( reset stones ) can be bought from a vendor at the left side ( where you enter in eden ) with merit badges or can be bought from other players. typical price is 8 merit badges or 4,7 million zeny's. Keep in mind that if you buy it for 8 merit badges that it only really cost you in the end 4 merit badges as you get 4 from the quest back again as reward.
Ti quests turn in's and gaining massive amount of exp.
1) You can buy bmx3 manuals ( battle manual x3 ), they give 300% more exp on monster kills but also with quest turn in from ti / bounty boards. These cost normally about 5 million zeny's each. only last for 30 minutes. Don't have the money to get it? buy a magical stone ( reset stone ) and sell it off and buy a battle manual for it.
2) Accept your first of the day ti quests and do them with a group, just grind with them until it disbands and complete your quest. ( don't turn the quest in ) the timer will reset itself when it counts down you will not lose your next day / next reset with it even you don't turn it in. So don't worry about that.
3) Wait a day until the timer is reset and buy 1 magical stone + 1 bmx3 manual.
4) Get a group for ti ( a good one ) and one that stays for 30 minutes. The moment it starts you jump back into eden use the battle manual x3 and deliver the quest from the last day and allocate everything towards base exp for magical level boost. You quests will because of vip get boosted by 150% and as you allocate everything into full exp that's another 2x the exp, and 3x more exp from the battle manual.
5) accept the new quest from the new day ( hunt both ) and join your ti group as fast as possible. If the group is fast you will be capable to clear the 400 counts in 14 minutes, then rush back towards gramps, deliver the quests and put everything into full exp.
6) reset the ti quests with your magical stone and accept the new ti quests once more and join your group + when done deliver this also.
Now you basically got 6 ti quests done with insane amounts of exp because of battle manual + vip and you get a ton of exp from killing all these monsters with those 2 exp helmets on top of it.
Anyway good luck.