Deception and Lies

Q: What should I do when I have cheated in Quran hifz and I have only learned 20 parahs. Now my teacher wants to take tests from me. If I tell the truth it would mean great disrespect to my family. I am very depressed.

Q: I currently live in Pretoria and work in Jet Park (I travel about 128km a day to and from work). Currently I use my car everyday to work and back. I have previously looked at the Gautrain as an alternative, however it worked out a little too expensive for me.

Recently, my small brother informed me that he receives a discount on his Gautrain trips (as he is a student) but doesn't use this discount as his campus isn't so far and it's easier for him to drive. As he isn't using this discount- He had offered it to me to use his discount to travel to work.

My question - Would it be permissible to use his discount for my benefit (considering he is a student and I am not)?

Q: Is it permissible to speak a lie to not make someone worried about you?

Q: Could you please give any advice how to stop lying?

Q: I told a lie to my mom that I passed my paper because she takes too much tension. Just to avoid her depression I told her that I passed and now she is offering 50 nafal of shukr... I regret telling a lie but I am afraid to tell her the truth. What should I do?

Q:

1. What is the sin for a person going against his word and lying?

2. How important is the word of a Muslim?

3. Will you be rewarded for making sabar on something you were cheated on?

Q: I have got a scholarship from the govt. based on my matric marks. I lied when in filling in the required form. If I would not have filled that in by lying, I would not had received the money... So can I use the money?

Q: I have a relative of mine who has come here 7 years go, first as a visitor and than claimed asylum saying to the immigration that her husband has used domestic violence on her and her daughters just to stay in the UK. Her husband had agreed to put that claim in with her at the time. 5 years ago her husband has gone back to his country and had applied for a visa for the UK on a number of times and has been rejected because of the wife's claim of asylum. The daughters don't know who their dad is, one is 9 and the other is 7. Their mother is persistent to get the UK visa regardless how it's affecting her daughters. She is lying to stay in the UK and is getting support money too. Obviously her means of staying in the UK are nothing, just a British passport. What does Islam say about this? 

Q: I use my neighbor's WiFi without his knowing. Is it permissible or is not.