if i want to apply to an ivy league college is it better for me to do the I.B or should i just focus on my normal grades and sent the letter to get of the applicants list?
I don’t really understand your question- are you asking if you should do the IB curriculum? If that’s the question, then yes, you should. You should be taking the most rigorous curriculum possible.
What “letter”?
The IB curriculum is well known around the world. If you happen to be an international student wanting to apply to US colleges, then IB is great. It is very rigourous and will prepare you well for University.
Also if you are an international student, then check out https://educationusa.state.gov/ for more info.
If you are a US Student, then talk to your guidance counselor about what classes you should take. IB is great.
Also work on your English if you want to apply to top colleges.