Should I Micro and A&P 2 in the summer?

Hi I was just wondering if someone could give me some advice. I am currently taking A&P 1 and political science now. I took all the other pre reqs already. I plan to take Micro and A&P 2 in the summer at the same time, is this a bad idea? I figure might as well start challenging myself now since I hear nursing school is a bigger challenge. Plus I don't want to wait until next May to apply for the program. I really want to apply in September for the January start. Can someone give me some advice. Thanks.