Wearing a jilbaab

Q: Is it necessary to wear a jilbab (a garment that starts from the top of the head), or is it permissible to wear an abaya (with the same coverage but starts from shoulders) along with a hijab?

Not wishing to listen to the Quraan before an exam

Q: Is it sinful to not want to listen to the Quran right before an exam because you fear that listening to it might cause you to forget some of the stuff you are trying to memorize for the exam? Would it take one outside of Islam to think that the Quran could cause any sort of harm? Obviously, harm can only occur with the permission of Allah, but I mean thinking that the reason for the harm could be the Quran?

Hijaab

Q: I wore hijab two years ago and now I really want to take it off. I have been waiting for few months for that feeling to change and it's not changing. I pray and I read Quran but the environment is not helping me. A lot of people are mistreating me because of it and I feel people treat me through the hijab not for who I am. I have been searching a lot to understand why I must wear it but nothing convinced me. 

Making masah over a gauze

Q: For the reason of taking medication through drip, I have a covering on my arm just below the elbow. This is a plastic tap held by gauze and cannot be removed for at least two days. Is wiping with a wet hand on top of the gauze when performing wudhu correct?