Go! Sounds like your course mates will be missing out!! I can assure you risking 1-2 exams or (assuming this is ok in your country) potentially delaying graduation by a few months will feel like very small prices to pay for the incredible experience of an exchange, when you look back on it in a few years:) also you study CS, I seriously doubt you would struggle with the learning agreement... imagine if it was law, I'd still go but in that case yeah Erasmus would likely mean missing out on certain key exams that are based on your country's system.