It is indeed quite possible for a while.
But remember that Forex is a zero sum game. And that there is balance in everything in this world. And especially, that as soon as you think you've got everything figured out, unpredictable situations happen. Be sure to be well prepared on all probable issues, because the leastest that you could imagine, can happen.
Let's say that, if scalping, 90-95% wins is equivalent to a 100%.
That's indeed close enough.