A year back
I loved a girl. Her friends said she loved me too. We never spoke. Her class teacher helped me.
Now
I park my cycle near her cycle. A guy who was my Ex-Friend said to not park my cycle near her cycle as his friend loved her too and beat me.I held some detective works to find out that she wrote a letter and gave it to that ugly class teacher stating that she will love him if he scores a state Rank in the Public examinations.

Should I continue to love her or Should I let her go?

I don't get any of this.
A teacher who helped you is now ugly?
And the girl you like is giving messages to that teacher that say she will love another guy if he does well in exams?
Makes no sense. Sounds extremely childish.
Especially all this time you never spoke to the girl you 'love.' That's not love.
Stop dreaming about ideal situations, and face the music. Talk to her about classes and music and movies and how nice she looks, and what she is interested in and likes to do. You don't announce your love, and you don't ask her out. That all takes time.

This is a mess....walk away and don't even bother with it.

Why would you want to be with this girl? Too much drama.
Walk away fast.

Either go directly to the girl to see if she likes you AND stop getting everybody involved your own personal business. Or leave this crap alone and go about your own business.