^^
Pretty much what he said, but do keep in mind mob families and be on the lookout for IT+++ to 75 mobs in random lowbie areas, lol.
You said you played 7 years ago, just keep in mind that some mob families make poor XP mobs for various reasons, and I dunno about anyone else here, but there's a few level gaps where your choices involve those said "yucky" mobs nobody wanted to XP on, ever.
At Lv85+, this is a non-issue as everything dies fast and easy, but closer to the 40s, it will make a difference.
Also worth noting, is if you have the choice, doing GoV 10 levels under or having to do FoV at your level, do GoV instead. GoV increases XP every time you complete a regime until you hit the cap. Usually this is WAY better XP than you would have gotten from the piddly FoV (which usually gives less than GoV started at).
This is especially true at 80+, fighting EPs and chaining GoV pages is much faster than struggling with EM-T mobs. The piddly 50-80xp difference per kill doesn't mean anything if you can complete two GoV pages in the time it takes you to complete one at the other camp.
Also, don't forget about the Emperor Band and Warp Rings! Not sure if you heard about them yet (I can't remember when Emperor Band was introduced), but they are found on the Conquest Point Vendor under "Common Items (All Ranks)". Emperor Band can be recharged by trading it to that NPC once per IRL week.
EDIT: Also, keep in mind that any mob that is aggressive to a Lv75 is still aggressive at Lv99 even though it can't hurt you whatsoever. This means they will also give XP and will qualify for GoV training regimes. Some good camps I found, later level:
1). Zeruhn Mines (Bats/Crabs, need Acid Bolts or Dispel). Nothing links, nothing aggros, perfect camp if you don't use a Trust with AoE Attacks. Pretty much where you should be going at 75.
2). Labyrinth of Onzozo, Ose's Room: Torama/Manticores. Both aggro, but there are several safe places and if you kill them in order you should not have trouble with aggro whatsoever. IIRC, this is late 70s to mid 80s.
3). Maze of Shakrami. Remember this place? There's Lv85-ish crawlers (don't forget Acid Bolts/dispel!) and Bats. Crawlers Link, Bat's don't, no aggressive mobs. This can last you clear to 99. This is near the one-way drop off leading to Buburimu, near the Geomagnetic Fount in the southeastern part of Map 1.
4). Fei'yin. Pots/Bats. Pots aggro to magic (your trusts cannot aggro mobs thankfully), bats do not link or aggro. This is nice if you don't have Lv99 sparks gear yet. Also an awesome place to get a ton of pot shards if you need to skill alchemy lol. The drop rate is just insane. This camp is near the entrance to the BCNM room.
5). Gustav Tunnel. THE place to go for solo merits! At Lv99 with Sparks Gear, these mobs are insanely easy to kill and give 300-650xp per and the GoV caps at ~4600 IIRC which is half a merit alone. Getting 10 merits in an hour and a half is not uncommon, when combined with RoE and a job that uses a 2H weapon (every swing gives credit for 500+ damage RoE quest).
6). Dangruf Wadi: Monkeys/Crabs. Not recommended, but can be done in mid-90s. Monkeys hit incredibly hard; highly recommend using Trion to tank them. Crabs link, so pull carefully. The room is at the extreme north end of the map, watch out for high level goblins on the way.
Edited, Aug 24th 2014 8:05pm by Lyrailis