1. Is spite of being a good student at school, I'm not motivated. It should be "IN spite of." In this context, "despite" probably sounds better than "in spite of." 2. I enjoy my work although I don't have good friends. This sentence is OK. However, it's a little bit vague. When you say "I don't have good friends," do you mean you don't have good friends who work with you? 3. I don't earn much money; however, I love my job. This sentence is correct! 4. Although I am not an expert in computer, I could fix my computer. "Expert in computer" doesn't sound right. Maybe "expert with computers" would be better. Not bad, overall. You used the contrast linkers well.

1. In spite of (not is spite of) 2. By itself, this sentence is unclear. Are you saying that you enjoy your work even you don't have any good friends at work? Friendships are often outside of work. Many people don't have friends at work but still enjoy their jobs. 3. Great! 4. This works.