Probably not

This site does not in general teach you how to be a good singer. It will help with some specific things that can be useful to a singer -- recognizing and reproducing pitches and intervals with your voice, recognizing and reproducing rhythms. I'm pretty sure it's a large part of why I now pick up pieces more quickly in choir, for instance. But it will not teach you basics of singing like good tone production, how to access the different parts of your range, etc.

Consider buying a course from a vocal coach.

this app is excellent for long term ear training which is an ESSENTIAL musician skill to have :) this of course includes a better singer! But it doesn't teach you proper singing technique, for that I would go with a singing teacher first if possible so you don't get bad habits, if you can't, try internet, self taught :/