Which of these motives for giving is wrong?

1. Giving to God because I don't have enough, so that he will double (multiple) to me what I have given to him.
2. Giving to God so that he will grant me favour in a job I am applying for, which I may not be the most qualified but I want to get that job.
3. Giving to God because I don't have enough for hospital treatment anymore, so that he can heal me, through that money I offered.
4. Giving to God to help me pass my exams rather than me sorting the lecturer or cutting corners when the exams was tough and I know I didn't do well as I had expected.
5. Giving to God because he commanded me to give.
6. Giving to God to help me end a case I have which have made me spend much and u am tired of spending. Let God through the giving strike out the case in my favour.
7. Giving to God because I was taught that if I don't give, I will have problems like lack, financial difficulties and God will send troubles to me.

All are wrong except number 5.