Best way to assist a friend in getting combat and cata xp

[AlexXu773]

Recently, my friend was ratted leading to his Microsoft account being hacked. He is joining my co-op (Networth 2.7b) on an alt. He previously had combat 45 and cata 34. I hope to assist him to get fast progression using coins. Any tips on how I could do that (Where to spend coins on, what gear to buy, how I can help him such as carrying slayer, most efficient method to progress (E.g. Grind Slayer and get Juju then go to dungeon))?

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