Is it possible my friend from Colombia can learn English as good as Native Engkush speaker?

No, you continue to provide sufficient evidence, on a daily basis, that Engkush is an extremely difficult language to grasp.

The only real way to get better at speaking a language is to spend a lot of time speaking to native speakers of that language.. Slowly even you accent will change if you really concentrate on how you are speaking..

I'd prefer a British accent.

I prefer Spanish accent when they speak English it's sounds very noticeable! When you have strong accent

I prefer a strong Spanish accent when they speak English

i dont see why not