次の試験は落ちるんじゃない？って英語でなんて言うの？

"次の試験は落ちるんじゃない？" は英語で
- Won't you fail the next test?
- Don't you think you're going to fail the next exam?
- Aren't you going to fail the next test?
といえます。

例文：
次の試験は落ちるんじゃない？勉強しないでだらけているから。
- Won't you fail the next test? Since you're just slacking off and not studying.
- Don't you think you're going to fail the next exam since you're just procrastinating?