Hello. It's an interesting question! Normally, 現在 is pronounced "げんざい." But just in songs and books sometimes 現在 is pronounced "いま" because the meanings of 現在 and 今 are same. There are many words like that. For example, some artists pronounce 君 as "あなた" even though it should be pronounced "きみ" grammatically. So, you need to pronounce it "げんざい" in your exam! If you are not sure what I mean, feel free to tell me!