Should I submit my paper to a journal that accepts papers quickly? Should I submit my paper to a journal that accepts quickly?

One of my batch-mate got accepted in a journal within 1 month. The journal was also listed on predatory journal's list.

Please advise.
Quick acceptance (a month) is pretty surprising for many disciplines, but that's not necessarily a bad thing in itself. But if the journal "guarantees quick acceptance", you should be very suspicious, since reputable journals do not bother with any rhetoric in that direction.

Being listed as a predatory journal is a very negative indicator... though, if we are scrupulous, we should note that those lists do not pretend to be infallible.

On the whole, I'd be suspicious. Better to go with well-known journals that do not promise such stuff.