Everyone joins forex with a view to become rich overnight or at least to make good profit for his living. So is is possible, Yes, this is offcourse possible, and as long as 100% profit is concerned it is also possible, but let me tell you the formula of profit:
The amount of risk you take = The amount of profit you make
So if you need 100% profit, you need to risk 100% of your capital, yes possible but risk, first practice on demo then go for real, again on real with small amount then gradually increase it