hi there, for first year science youll need a Sharp EL-510RNB Engineering/Scientific Calculator (or a similar model) https://www.amazon.ca/dp/B00000JBMA/ref=cm_sw_r_cp_apa_i_7EAtDbS2AVBJ7 wait until you get your course outlines to be totally sure, but this is the calculator we used in chemistry, applied math, bio, etc last year!
For chemistry you'll have to purchase the course workbook AND lab book from the Bookstore. Other courses, like applied math last year, provide the textbook. In other courses like Calc, look around online for the edition you need (with solutions!!) before purchasing it because you might find a pdf :)
I'll tell you what I think: get rid of that graphing calculator. It will only harm your mathematics education, and if you really need to visualize something in a pinch, just plot it in wolfram-alpha instead. Graphing calculators should really be banned from the education system. Get yourself a nice simple scientific calculator like this one for 10 bucks instead, and do mental math/scratch calculations whenever you can. And don't use decimals, use fractions and exact forms as much as you can too (like root 2 instead of 1.414, etc). Just some friendly advice from someone who has done a lot of math =P