Buying the textbook for MATH1131 isn't necessary, the course notes should be sufficient. The textbook is a good supplementary source, if you need it, there should be copies in the library.
You'll need the PHYS1131 lab manual, but you can print that off (although, it's about 100 pages for PHYS 1A - the lab manual in the book shop also includes PHYS 1B which makes it twice as big). If you buy the lab manual, you will also receive the homework problems booklet, otherwise, you can also print that off from Moodle.