Central Board Of Secondary Education [CBSE] — Duration provided for applying for re evaluation

My younger brother applied for re evaluation in class 10th science paper (Cbse) and received the answersheet copy and on tallying with marking scheme we found that many answers he should have been awarded mark. Since only 2 days window (10/8/20and11/08/20) was provided we couldn't apply withing this period due to network issues. Sir, a student works hard throughout the year and wait patiently for result after exams. Due to negligence of very few evaluators, students shouldn't suffer. I appreciate that cbse gives opportunities to are evaluate but 2 day window is creating problems and i am sure many students facing the same issues. Keeping in mind the present situation we facing due to pandemic kindly extend the dates for re evaluation.