Know which key you intend to use
Evo Deathmatch Shooter assigns weapon changes to keys one, two, and three. Before an encounter becomes busy, learn which available selection each key produces in the current game. The description promises multiple weapons but does not establish their order, statistics, or availability from the start. Build the mapping from the real interface instead of assuming a familiar weapon belongs in a particular numbered slot.
Separate selection from firing
A useful practice sequence is to choose a numbered input, confirm the displayed selection, and only then perform the intended action. This makes an accidental selection easier to identify than rapidly alternating keys while continuing to fire. The controls specify left mouse for firing and right mouse for targeting, so changing equipment and using it are distinct inputs. The point is reliable selection, not a claim that rapid switching provides an advantage.
Keep the rest of the layout clear
WASD or arrows move, Space jumps, and left Shift runs. Establish those controls separately enough that reaching for a weapon key does not obscure which movement you intended. Read the current level objective as well: the deathmatch name does not prove a particular multiplayer format. A useful early milestone is selecting the intended available weapon consistently, without inventing reload keys, switching penalties, or equipment rankings.