Sheikh I read in Hisnun Muslim (fortress of the muslim) some adhkars and then I found that some supplications which is there is graded to be weak by Sheikh al-Albani.
I would recommend not to say them. You can also see this link http://www.assimalhakeem.net/node/536
My friend is seeking advice from me about individuals who committing haram asking me what should she do about it.
This is backbiting as she should have only asked you about what to do if people did this or that and without naming them.
Shaykh what is your personal preference in regards to how many times the surahs and ayahs should be recited, 3, 5 or 7?
There is no preference. It has to be odd numbers. The more it is the better but i believe it should not go beyond seven times.
Non-Muslim teacher and colleagues in class have insulted Allah and Islam.What should I do?
You should leave that class and file an official complaint with the uni and with the authorities.
If one harbour envy, jealousy and ill feeling about other without speaking or acting on those, will he be sinful or not?
It appears that such sins of the heart, one is sinful because he has intend it with his heart and it was out thoughts crossing his mind.