I feel you, i ve been sick as well and have all my exams next week.
Take Vitamin C tablets (it genuinely helps) and drink loads of water.
It s really hard to concentrate when you re sick but i feel like studying early in the morning is much more efficient (idk for u but i feel worse at night) so yh maybe try that. When ur feeling like resting just find a video on like youtube about the subject u need to study and watch that. It s passive revision but u still actually end up remembering stuff so yh goodluck