The COVID-19 pandemic forced much of the world into lockdown. For that reason, INTTIC switched from blended learning to total e-learning. In this paper, we explore the impact of e-learning on INTTIC students during the COVID-19 lockdown. To this end, we focus on four main variables: the effectiveness, the cost, the flexibility, and the independent work involved in e-learning. Our results show that e-learning cannot be entirely effective without the teacher's online interaction. It is budget-friendly because students can save on transportation, food and daily school expenses, and it offers students a large degree of flexibility. Nevertheless, almost all students struggle to complete their homework on a deadline. The main causes could include the psychological aspects of lockdown, the lack of prior experience with total e-learning, and a need for teachers' supervision. Future research should study the impact of e-learning on teachers during the COVID-19 lockdown.