The best way would probably be to quest it out at the beginning. For example, 30/30/30 takes way longer training on monsters than doing Waterfall Quest and getting 30 Defence. If you are planning on using a Dragon Scimitar on the account do Monkey Madness early and actually benefit from the quick 110,000 XP. After that some people do Rock Crabs, Chaos Druids, Flesh Crawlers, Yaks, Experiments or NMZ. It's up to you, they're all relatively close XP wise. The best way would probably be to do 60 Attack, 70 Strength, 70 Attack, 70 Defence using Dragon Scimitar and then Whip for Defence. Also this will probably take around 100 hours or so.