The transition from theoretical learning to practical application is a critical phase in teacher training, especially in the context of the post-COVID-19 era. This study aims to explore the experiences of trainee teachers during their internships, focusing on classroom teaching, institutional management, school environment, co-curricular activities, guidance and mentorship, and psychological aspects. Utilizing a mixed-method approach, the research surveyed 35 trainee teachers from the Nadia district, West Bengal, using a structured questionnaire that included both closed and open-ended items. The results reveal that a majority of the trainees reported positive experiences across all dimensions, with significant strengths in classroom teaching, mentorship, and co-curricular involvement. However, challenges such as classroom management, administrative support, and psychological stress were also noted. The findings highlight the importance of supportive environments and effective mentorship in enhancing the internship experience. The study concludes with recommendations for improving internship programs to better support trainee teachers, ensuring a smoother transition into their professional careers.