easy stage 1 or 2 science papers

For sem 1, I am taking MedSci 203 and 205, and I don't know which other two courses I should take. I wanted to find out about some low-stress courses that are preferably easy to learn and understand, and maybe even open-book for the exam. I have taken Earthsci 105, Env 102, and Stats 100 last year, if that helps. According to my degree planner, I can take 2 stage 2/3 science papers, 2 any-stage science papers, and 1 any-stage or module paper. Thanks!!