This is a guide to minimise grind by saving quests and doing them later. It also includes the Mini Dragon quest, which you get at level 46, I suggest you do them at level 5x.
Tip: Always check
Wiki to ensure you've picked up all the quest for each level.
It's a guide, and should only be used a guide only.
Here we go:
Level 50 - Need 954,916 Exp
Do all the level 50 quest, plus MD 1.
46 Lost Mini Dragon 1 (140,100)
50 Clear beautiful complexion (64,100)
50 Traces of Beast 1 (78,200)
50 Traces of Beast 2 (82,800)
50 Arrogant Guard Paulmon 1 (28,800)
50 Arrogant Guard Paulmon 2 (63,400)
This level, you'll still have 497,516 exp (52%) to grind. I guess do it in abyss, or hopefully you've saved your Ogre of Tonic quest from level 49, that'll help you out a bit.
Level 51 - Need 1,093,480 Exp
51 King Coll brothers (81,000)
51 Ogre's Invasion (304,000)
51 Grandma Myzen's Wrath (Repeatable) (81,200) - Do it 8~9 times.
Level 52 - Need 1,239,784 Exp
52 The Unbreakable Chisel (Repeatable) (122,900) - Do it ~10 times.
(Make sure you pick up Rare Herb but don't do it yet.)
Level 53 - Need 1,405,180 Exp
53-58 Need Blood - 106,800
53-54 Delivery interrupter (Repeatable) (147,400) - Do it all the way to level 54.
Level 54 - Need 1,592,115 Exp
Continue with Delivery Interrupter (Repeatable) (147,400)
Level 55 - Need 1,803,343 Exp
52-59 Bats in your Belfry (99,600)
55 Escape from Concealed Prison 1 (113,300)
55 Escape from Concealed Prison 2 (Repeatable Quest) - 178,500 - Do it ~ 8 times.
Level 56 - Need 2,041,966 Exp
Here's the sweet part! Where you can hand in most (if not all) your quest items!
52-58 A light of Elderine 1 (93,800) – Lightning Vivi
52-58 A light of Elderine 2 (97,500) – Lightning Vivi
56 Torurer Abuse (129,300) - Torturers
53-58 Paulmon's Threat 1 (129,800) – Prisoners and Torturers
53-58 Paulmon's Threat 2 (122,900) – Prisoners
53-57 Julian's Revenge (113,300) – Prisoners
55-61 Flags of the Inmates (122,900) - Prisoners
54-58 Voice of Spirit (136,000) – Dead Tree Soul
54-59 Paulmon's Plead 1 (137,600) – Dead Tree Soul
54-59 Paulmon's Plead 2 (153,200) – Senior Torturers
54-62 Fragrance Grass of Obey 1 (154,900) – Senior Torturers
55-60 Shutain's Last Gift (149,700) – Senior Torturers
55-59 Black Seed (156,600) – Senior Torturers
46 Lost Mini Dragon 2 (290,800)
Level 57 - Need 2,311,478 Exp
57 The Master Criminal Repeatable (90,100)
Need to do it ~25 times. Maybe space it out with some PVP KQ.
Level 58 - Need 2,615,809 Exp
52-55 Rare Herb (66,100) – Gather Items
56-60 Desharken's Blue Hides (176,900) - Des Harkan
56-62 Soft Carpet (176,900) - Des Harkan
57-61 Bad Boys (161,200) - Des Harkan
58-63 Forbidden Karasian Magic 1 (198,200) - Karasian Soldier
58-63 Forbidden Karasian Magic 2 (198,200) - Karasian Templar
57 Lost Love 6 (199,700) - Karaisan Templar
57-61 Karasian's Magic Scroll (213,500) - Karasian Templar & Karasian Arch Templar
56-62 Fragrance Grass of Obey 2 (213,500) - Karasian Arch Templer
50-59 Bonds of Darkness 1 (58,400) - Dungeon
50-59 Bonds of Darkness 2 (67,700) - Dungeon
50-59 Bonds of Darkness 3 (76,300) - Dungeon
50-59 Bonds of Darkness 4 (87,400) - Dungeon
50-59 Bonds of Darkness 5 (98,400) - Dungeon
50-59 Bonds of Darkness 6 (133,900) - Dungeon
50-59 Bonds Of Darkness 7 (200,800) - Dungeon
58-65 Dangerous Web (231,000) - King Spiders
Level 59 - Need 3,056,416 Exp
54-60 Food Supply (84,000) - Gather Items
59-63 Curly's Store Key (161,800) - Gather Items
59-63 Hans' Grandmother 1 (163,300) - Gather Items
59-63 Hans' Grandmother 2 (150,400) - Gather Items
59-63 Hans' Grandmother 3 (150,400) - Gather Items
58-66 Monster Cleanup 1 (278,800) - Pinkie, Archon Junior, Ratman Knight
58-66 Monster Cleanup 2 (386,100) - Pinkie, Archon Junior, Ratman Knight
58-66 Monster Cleanup 3 (514,800) - Pinkie, Archon Junior, Ratman Knight
59-63 Archon Junior Gang (221,700) - Archon Junior
58-65 Genki (240,300) - Pixies
59-63 Woz's Big Secret (432,800) - Karasian Arch Templer
46 Lost Mini Dragon 3 (376,800)
Good Luck!