Is it possible to win a game with a tower in each side and a bishop just in one side
Rook and Bishop vs Rook is generally drawn with correct defence.
Although there are some rarer positions where the side with the bishop is winning of course (For example, being able to pin the rook to the king with the bishop). Since defence can be difficult, it is still worth trying to win rather than agree to draw, assuming you have the bishop.
To draw if you're only black, I'm guessing you should stay on the opposite color squares of the opponent's bishop, and make sure you aren't on the same file or rank as your rook (tower). Just make sure you don't go too close to the side of the board. If they're blocking you off, then just your rook carefully to stop them. (From a 1375 rapid, so not the most trustworthy source)
To draw if you're only black, I'm guessing you should stay on the opposite color squares of the opponent's bishop, and make sure you aren't on the same file or rank as your rook (tower). Just make sure you don't go too close to the side of the board. If they're blocking you off, then just your rook carefully to stop them. (From a 1375 rapid, so not the most trustworthy source)
In reality, it's very difficult to defend correctly. Occasionally even grandmasters lose it.