48+% acc is no big problem in a pub server. It's not what you need to win tho. Headshotacc is what you want!
Try to know where the people come from, use the corners to pick their heads. Take people one at a time.
Get a good mouse that is easy to handle like MX512 or any other gaming mouse (20$ gets you set up)
Get a decent, no clutter, no shit config, something simple. Too bad i deleted mine.
Use rather slow sensitivity, you should be able to do a 180, no more.
Go look for "Aiming by Raziel" on google, it's an aiming guide.
Practice on etpro server.
Dont play Jaymod, if you want to gain SOME skill play at least the hardcore server when it's not full (10 v 10 is ideal for aiming practice in general) an ETpro server (TZAC) is even better (~Google it)
Play max 3 maps in a row, then do something else.
Talk ingame with people, it diverts the mind a bit but it will keep you sharp.
Dont prac against Bots, thats retarded.
for 15$ an hour i can make you go 80-10 on the hardcore server 2 out of 5 maps in 2 months, guaranteed.