Well , for some reason they need to take quite sometime for hacks to get detected and thus VAC banning everyone who are using the same hacks and so on.

Also , the only way to get promoted is to win matches , with kills a slight consideration too. Tied matches are counted too though not much but yes it does count , I was once promoted from a tied match.

Pretty easy to rank up nowadays actually , after the massive VAC bans that cleared up a lot of the hackers and ranks , nowadays you can see LEM's , SMFC's playing like 2AK's , lol.