If you insist on studying biology as a graduate student and it is interdisciplinary, I admire your courage. In response to your question, first of all, I think biochemical engineering is better, in terms of fermentation and equipment.

Biochemistry is a big direction. What you want to learn depends on what your future tutor will give you. If you want to take an examination of engineering, such as biochemistry and bioengineering, you have to take an examination of politics, English 1 and Math 2. There are several specialized courses to choose from: biochemistry, organic chemistry, principles of chemical engineering, etc. There may be some differences in the content of specialized courses in different schools, but basic students are one of these three courses, and you can choose one of them. If you take the science exam, you will take two professional courses, depending on the regulations of the school you take the exam.

Note: As a non-biological major, it may be a little difficult for you to read professional books on biology. If only you were good at math and English. The book of biochemistry is very thick and contains a lot of contents. The principle of chemical engineering is still very difficult, and so is organic chemistry. The difficulty of the examination of specialized courses depends on the school you want to take. A good school and a good professional natural course will be more difficult. However, there are still many successes in cross-professional examination and research. I hope you can succeed. Word for word, hope to adopt, thank you!