This guy says that his style will make a Full Certified Warrior & Killer
out of me in 3 months---is he serious?
In short: NO.
First off, while many people enter the Way of the Martial Arts trying to be
the deadliest people in the world, it is not true that the final objective
of most, if any, Arts is this. Many Masters say that the best battle
someone can win is one that he doesn't fight. Most martial arts are not
designed to make you an instant killer.
Secondly, don't expect any miracle to come down on you, any light to come
through your window in the night and make you the most skilled fighter- it
all depends on your dedication, on your objectives, and on the amount of
training you get. Any school that promises to teach you to be an "expert"
in less than two years (at the lowest minimum) is probably a scam. General
net consensus seems to be that results can be seen within a few months but
the elusive "MASTERY" is the product of YEARS and YEARS of dedicated work.
Don't be fooled by false promises.