If we only talk about "good", I think Tsinghua is better than Tongji, because Tsinghua only takes structural mechanics in the early stage of professional courses, and Tongji takes materials mechanics and structural mechanics. As far as the difficulty of the test questions is concerned, Tsinghua's questions are more traditional. You have thoroughly understood all the exercises of Long Yuqiu's structural mechanics, and it is not a big problem to test 120 or above, while Tongji's questions like to test structures such as variable cross-section, diagonal bars and arches, especially the position of symmetrical structures. You usually need a second split. Of course, your mechanical foundation is solid, and any exam is the same. In addition, in terms of admission rate, Tongji is a little higher than Tsinghua. In previous years, Tsinghua basically only recruited one or two students (70% were recruited internally, 20% were exempted from exams, leaving few places for unified recruitment).