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.

3 answers

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