Yep. For legal immigration (except family ties) you need a 12 year school education. For work visas you need the appropiate educational and professional background.
If anyone fits the criteria for needed skills, does it legally and has no criminal/terrorist background they are welcome. I don't care what "caste" or ethnicity they are from. Every race and ethnicity harbors great minds, and we should be attracting them to contribute to our society, instead of letting illegals flood our borders.
Regarding Ashkenazim... it's not about DNA, but the fact that they were a pretty close knitted community with great emphasis on education and career throughout generations.
So given this information it might be more important to target ethnicities in which education, personal improvement and close familial ties are valued.
Strong marriages make strong countries.
This, then, undermines the 12 year education requirement, no?