California Institute of Technology

Caltech is known for being very selective about who they accept. For the academic year 2022-2023, the university received an applications of 16,000, however out of that only 448 students were accepted, which means Caltech University acceptance rate of just 2.69%. This low late shows how competatitive it is to get into Caltech. The university fouses on Engineering and Sciences making it more challenging. Hence we can conclude by saying Caltech is most academically difficult university. 

The California Institute of Technology is globally recognised university, with international students from across the globe, this university is a popular destination among international community. The university has very low student to faculty ratio of just 3:1, which is very less compared to national (US) average of 18:1. The Caltech University is one of the top university ranking 15, as per QS World Universities Ranking.