Landing hills are packed VERY hard; if there's fresh snow, it's scraped off.
As for scoring, there are typically five judges, but the high and low scores are tossed out. Each judge can award up to 20 points for technique. There are 20 points (x 3 judges) automatically assigned for distance, and hitting the K point exactly gets the jumper 60 points.
Going further, than the K point gets you more points; coming up short gets you less. A skier can't get more than 60 points per round for "style" (technique), but they can go way over 60 for distance. So a good jumper will get perhaps 55 points from the judges, and maybe 65 points for distance, which adds up to 120 for that round. A tournament has two rounds, so a 240 point score is very good. When scores get to that range or higher, it's because of flights considerably beyond the K point.