RLWL comes first- see below
RLWL = Remote Location quota waitlist
On long distance trains, some stations along the route will be designated Remote Location stations, these will be big stations, and mostly where the train will call at the chosen station (and at the destination station) at popular times, it may also be a station that many people will book to (from the originating station), and this can mean that many seats/berths will become available at the remote location station.
Remote...
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Location stations prepare their own reservation chart 2-4 hours before the train is due to arrive/depart from that station, or the evening before in the case of late/very early departures.
PQWL = Pooled Quota waitlist
Pooled Quota is basically anything not covered by the other quotas, though the General ad Remote Location quotas take up most berths. (and lately the Tatkal quota).
Pooled quota can include (though not always) Originating station to intermediate station, Intermediate to intermediate, and intermediate to destination station (though it would be separate from remote location quotas).

FYI: Charting of PQ happens @ source station & its quite huge count berth been allotted under PQ as against few berth for RL (provided train isnt Rajdhani or with very few stops)!!
This charting ensures vacant GN Quota berth gets utilized for PQ Clearance but RL & this plays a much big difference...as RL has to depend on RL Cancellation or berth cleared out of Source Station Charting (GEN Quota station charting), which gets released only after complete deployment of vacant berth to source station quota (GEN/PQ)!!
& its wrong say that...
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PQ is anything not covered by other quota: Thats RQ!!