In today’s digital age, the integration of artificial intelligence (AI) technologies into educational settings has become increasingly prevalent. This study explore the utilisation of custom Generative Pre-trained Transformers (GPT) and prompt engineering techniques to enhance the role of ChatGPT as a study companion. Through a combination of qualitative and quantitative analysis, this study investigates the reliability and efficiency of personalised GPT models tailored to educational texts and preferences of each student and the strategic use of prompts to guide learning interactions. By harnessing these innovative approaches, students can potentially improve study efficiency and comprehension enhancing the whole studying experience. The findings shed light on the benefits and challenges of integrating AI-driven study companions into educational practices and provide insights into future directions for leveraging AI technologies in learning environments.