The point is that your argument against immigration causing problems in schools is illogical - I have provided two examples that demonstrate that it is not immigration that is the problem - it is poor management by Government, LA or the school itself. 
Our closest primary (not actually our catchment though ) is 98% EAL 
- so there's a 3rd example 
(In fact, most of the schools in Glasgow would demonstrate the fallacy of your argument).
It is perfectly possible to have good schools with immigration - with appropriate resources which is a government decision (and the fact that that in England, Westminster chose not to allocate the additional revenues that EU citizens bring in, yet to allow them to be blamed for the pressures on resources is particularly egregious 
)
Within the last 10 years, ds' secondary has recently had to cope with intakes that consist of 10% solely of Roma, as well as Polish, Slovakian, Serbian, Albanian.... so don't give me the "too high in too short a time argument" 
Where I am, we don't blame the EU. The school has "cultural lunches" to celebrate all the countries and ethnicities that make up the heritage of the school.
Only small minded or ignorant people would blame the EU for actions which are the deliberate choice of the Westminster Government. 
(And I'm not even going to start on the fact that it was the UK that pushed for the rapid accession of the Eastern European states and it was the UK that chose not to put in any controls over Eastern European immigration when it could have done so )
Your "argument" against the ECJ is equally illogical, as it seems to consist of a fallacious "because" - with no more evidence than "because you don't like it" No examples. No explanation as to why you'd accept a WTO arbitration or indeed, apparently, "any other" court of arbitration, as long as it's not the ECJ
But it's ok, because you are doing wonders to illustrate the fallacies and illogicalities of Brexiter arguments.