I dont know how this study arrived at the figures but I can tell you what I have seen and gone through.
My kid completed his 5th grade back home and got admission in 6th grade in Canada in Sep 2010. Back home he was getting excellent grades and was out performing in education, sports, extra-curricular activies etc
PROBLEM FACED BY MY KID :
>>> problem in understand the teachers way of teaching.
>>> problem in adapting to school atmosphere.
PROBLEM FACED BY ME :
>>> No books, no syllabus and no prior knowledge of Canadian education system followed in school.
>>> Not knowing the style, expectation of teachers.
So, initially I was no help to my kid. I visited the school twice for interview and saw that the performance of my kid had fallen a lot. No homework and nothing much in classwork I was unable to asses the situation. I became frustrated by all this, but was looking for the way for turnaround.
WHAT I DID :
1. Kept encouraging my kid to do better.
2. Bought some books for 6th grade from market and told my kid to start with that. Nothing to do means read these books.
3. Brought variety of books including comics from public library and encourage my kid to go through it.
4. Helped kid to do french homework.
5. Assisted him in getting project ( power point presentation ) work done.
6. Borrowed books from english, SST teacher. Others said "NO, CANT BE DONE, EVEN WE DONT HAVE BOOKS".
7. Gone through the class test sheets with the teachers and understood the style of questioning.
8. Litrature book being taught in english class, I borrowed from public library and my kid gone through in advance the entire book 3-4 times and it helped him in class.
9. With no homework and not much in class made by kid to spend some time on these websites :-
http://www.linktolearning.com/http://www1.teachertube.com/http://www.eqao.com/Parents/Elementary/036/BookletsandGuides.aspx?Lang=E&gr=036&yr=06These websites contains of full course of students of peel board and are very exciting. My kid started spending hours and hours on it. If you go through it you would find that kids can really play and study here.
END RESULT :
>>> My kid has now reached the level of A- and I expect by the end of this session he would be A+.
My plan is now to put him in neighbourhood sports activity so that he can pick up gome goods sports skills like ice skating, basketball also. Summer time would be swimming time. I must tell you people that any money spent on these activities are deductable from Income for tax purpose.
So dont get bogged down by seeing the outcome of report. Believe in you, your kid and do your best.
If you go to IB and IBT school program , you would find that 99% students there are non natives. So, I believe that ir respective of the above mentioned study, immigrant's kids would not lag behind native's kids in education. WE ARE THE BEST OTHERWISE WE WOULD NOT HAVE BEEN HERE.