Ha not that way ! Think of that , you are in a group of people who also do not speak English well. End up being friend and hang out together , using Cantonese or Mandarin, only using English in class ..
I was in ESL and my friends too.. my English was improved after I got out of ESL. ESL is useless …
One more thing .. One can study from grade 8 to grade 11 ESL ! That means he or she would miss other classes that those regular students taking.