There are several synonyms for the phrase "study at will", all conveying a similar meaning. One common synonym is "self-paced learning", which refers to the ability to study and learn at one's own pace without external constraints or a fixed timeline. Another synonym is "flexible study", which emphasizes the idea of having adaptable study plans that can be adjusted to fit individual schedules and circumstances. "Independent study" is another synonym, highlighting the autonomy and self-direction that is characteristic of learning on one's own terms. Overall, these synonyms all suggest a style of learning that prioritizes individual agency and the freedom to learn in a way that suits one's needs.