Yup. overleveled on all of them.
Especially the first one, I picked out a page from my railgun raws that is RIDICULOUSLY easy. just clean the bubbles and it's done, no leveling/etc needed. Yet you still overleveled.... To know if you overleveled or not, make sure the grays are intact. Also, leveling isn't made to darken/lighten the picture. It made to remove MOST dust from blacks and whites.
Don't worry, with some practice leveling will come. Even i occasionally underlevel sometimes(I'm a cautious person xD)
2nd one joined decently, however, the join looks awkward in some parts, like the top. it goes froma dark shade to a light shade(wtf), but u can fix that with burn/dodge tool.
Also second has alot of dust. blacks are not completely black and whites aren't completely white.
3rd is OKAY. You can pass it off with a good typesetter who can cover will, but otherwise it's unacceptable. for example. the window is missing a line. doesn't matter how shitty of a line it is... having something is always better than nothing.
the tiger's tail looks awkward in the way it gets lighter at the tip. but otherwise, the lines coming down from the panel look fine.
Bottom right redraw looks fine, it's TM quality, so I'm not gonna rant about it.
Don't worry, leveling is your main problem. Once you can level well. redraws and the rest shoudl come easy at your current level.