Studies have shown that students in immersion programs do as well as students enrolled in a regular classroom. The subjects of mathematics, science, social studies and health lend themselves well to foreign language learning. Studies have shown that because the children all begin on the same level of proficiency, a student on an IEP does not feel the level of stress they would experience in a regular classroom. Yes, studies show that immersion students will do as well as their mono-lingual peers on achievement tests. No, they will not.
Language acquisition occurs at different stages.
The first year is primarily a period of listening development which expresses comprehension through minimal verbal and non-verbal responses. Additional development in language acquisition is expected with further exposure and continuation in the program. No, your child will receive instruction in English so these skills will continue to develop at a natural pace. You can expect an initial stage of frustration and confusion. Learning a new language is hard work and can be very tiring.