There is nothing wrong with raising the standard for the level of English required in schools. This does not mean that every student should have to meet that requirement immediately. However, those students that are falling behind or are ESL students should receive extra time and attention in order to meet the standard.
No, the English standard should not be raised despite low English proficiency levels, because students cannot benefit from education that does not meet their needs. If students do not speak English well, extra, remedial classes should be made so that education can be geared towards the level of each student, where they need to improve.