Someone please correct my sentence

So are you going to accept the challenge?

That part is fine. The rest is a mystery.

Thank you teacher
But can you please tell me weather the rest of that sentence is grammaticaly correct or not?

It is not correct, and not comprehensible. What are you trying to say?

Let's assume like this,
As there are many games in the sports day, what I want to say is; "are you going to accept the challenge of running with my friend to select me to which one's running ability is good? '

Who are you writing this to; your teacher?

dilshiare you going to accept the challenge of running with my friend to select me to which one's running ability is good? '

I cannot understand your sentence. It is so ungrammatical that it makes no sense.

Are you going to ask me or my friend, who can't run as fast or as far as I can, to run with you?
Are you going to accept the challenge of runn

dilshiaccept the challenge to select me to which one's ability is good?

Why would it be a challenge to "select me"? Select me to do what? There seems to be a verb missing.
Try breaking the whole thing down into two or more shorter sentences. We just don't understand what you want to say.