Is there anyway available (training or better weapons) to improve aiming, it seems I do a lot of shooting that hits nothing.

Another question is there a way to switch the radars? I mean I want the rear to be on my left side and the front on my right side.

Guns with higher velocities will have tighter aim (the projectile spends less time traveling to its destination, so the target has less opportunity to move out of the way). Some weapons do have a wider auto-aim cone, which can also be useful. On the other hand, auto-aim doesn't deal with acceleration very well, so sometimes it can be beneficial to turn off the auto-aim so that you can do it yourself.

Note that if you're using multiple weapons and they have different velocities, your leadoff indicator will only be accurate for one of them. If the weapons are bound to different triggers, the one on the primary trigger will control the indicator. I don't know how it determines control when both weapons are bound to the same trigger. There is a plugin available called TCS which has a module called Multiaim that provides additional indicators when using multiple weapons.

There isn't a way to swap the radars with the default client, but you could write a plugin to do it. Draugath's MDI HUD plugin probably also let you do that (it lets you drag HUD elements around to re-position them).

Thank you for the information. How do I turn off auto-aim?

With the colon key, if you're on PC. (F1 is useful for seeing many of the bindings, incidentally.)

I don't have a mobile device, so I don't know how it's done on those. Worst case, you could use the following command via the chat bar: /toggleautoaim