(iv) Exception.--Notwithstanding the notice requirement in clause (iii)(I), the cost of reimbursement--

(I) shall not be reduced or denied for failure to provide such notice if--

(aa) the school prevented the parent from providing such notice;

(bb) the parents had not received notice, pursuant to section 615, of the notice requirement in clause (iii)(I); or

(cc) compliance with clause (iii)(I) would likely result in physical harm to the child; and

(II) may, in the discretion of a court or a hearing officer, not be reduced or denied for failure to provide such notice if--

(aa) the parent is illiterate or cannot write in English; or

(bb) compliance with clause (iii)(I) would likely result in serious emotional harm to the child.