It is not a good idea to rely exclusively on reading through old exam solutions as a way to prepare for the uniform exams. In particular, this semester's course director may not have written any of the exams available from this page, so the ones he/she gives will almost certainly have a somewhat different flavor to them.

The best use of old exams is

to familiarize yourself with the typical format for a Math 105 exam, which usually consists of some mixture of short-answer questions, fill-in-the-blank exercises, longer exercises with work to be shown, and essay questions; and
to test your readiness to take the exam after you believe you have prepared enough.

If, after studying for the exam, you can take the old exams quickly and confidently in the allotted time without peeking at the solution sheets, then you have a good chance of doing well when the actual exam lands on the desk in front of you.