I wrote this sentences. Could you check them. Thanks

1. If you were interested, you could take another course.
2. If I were you, I’d study Norse tales.
3. If he really wanted to go into science, he would take biology and chemistry.
4. I wouldn’t have suggested he take business if I knew he is going to be a genetics.
5.You’d made a good addition to our science department if you were prepared to do research.

All are correct.

In 4, "... to be a genetics" what?

... a genetics professor
... a genetics researcher
... a genetics specialist

A noun is needed at the end of that sentence.

a genetics specialist

thanks

Sure, I can check your sentences for you. Here are the corrections:

1. If you are interested, you could take another course.
2. If I were you, I would study Norse tales.
3. If he really wants to go into science, he should take biology and chemistry.
4. I wouldn't have suggested he take business if I knew he was going to specialize in genetics.
5. You would make a good addition to our science department if you are prepared to do research.

Note: In the first sentence, "were" can be correct in some contexts, but in this case, "are" is more appropriate as it refers to a current interest. In the second sentence, "I'd" is short for "I would." In the fourth sentence, "is going to be" should be replaced with "was going to specialize in" to match the past tense of the verb "knew." Overall, good job!