@Anna C,
@Pavel Macek...
I agree with Anna. When you first face even the idea of the 5 min snatch test, either your technique is wanting or you've been looking at the snatch as a lighter conditioning tool, or both.
The A+A snatch format is designed to use a moderately-heavy challenge for the load. For a novice, this might be lighter than their snatch test bell. Well, then, it's time to train, right?
While I believe that a density program might get you there quicker than a diet of A+A snatches, the adaptations from the latter are far longer lasting, and wider in the breadth than the former. I would start 6 months out (even a year) and stay on an easy but heavy snatch program as most of the SFG prep: the other skills need to be practiced but not "worked" so hard.
The A+A platform will eventually get you very close to the event, if not meet the standards without peaking (this is common). It is not unusual to peak for the test with 1-3 sessions lighter capacity sessions. Moreover, there is something about the snatch that, when used properly has the absolute highest carry over to other capacity needs. The squat and maybe the get up need their own capacity models separate from the snatch, but it isn't that much. Skills are another story...
In my own recent experience, I had been toeing the line of doing just enough in training due to other life obligations. Maybe I was doing 2 sessions per week of 50-100 total snatches each with the 36 or 40.... this was all the resistance training I was doing. I went into my recert in front of Jason Marshall with one capacity session with the 40, and one with the 32. He'll vouch for how "pleasant" the test went with the 28.
There's something about being strong first that makes a key difference; but I don't know where I heard that before.
My caveat to this is... do not run out and start snatching a 32 or a 40 if you haven't built a base.