Haven't been in there for many years but a couple of things spring to mind.
Flying and aiming is challenging but if you've been practicing it for years or even a decade or more on the same simulator you get pretty good at it. Not a surprise that some players can aim with precision and skill and drop an enemy aircraft very quickly.
Also the points you gather are a total of everything that you're doing. If you shoot down one four engined bomber and land back at base. That's 400 points. If you do that twice in a round you already have 800 and it wouldn't take that long. If there are ground targets and you take out a couple of truck convoys then the numbers really do add up. Ultimately you really need to land at the home base to get your full points (otherwise its 10% of the total for your score). If you crash or get shot down then you only get a few. I try not to make it about points but about a fun experience.
All I can say is practice, make sure you're very comfortable with flying your aircraft(s) of choice, and work your way up from there. Supposedly impossible shots aren't that impossible with practice. Some days will be better than others too so sometimes you just have to put the game down and try again another day.
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