SIAM: Math Matters, Apply It!

https://www.siam.org/careers/matters.php

Try these problems from historical Tripos

A trip into Mathematical Tripos through its history

Looking at this:

http://maths-obsession.blogspot.sg/2015/05/searching-for-mathematical-tripos.html

Many links are outdated, so perhaps here are some updated links:

https://www.maths.cam.ac.uk/undergrad/pastpapers

And these are the pre-1878 era:

https://www.ocf.berkeley.edu/~lekheng/tripos/math-tripos-pre1878.pdf

And lots of others:

https://www.ocf.berkeley.edu/~lekheng/tripos/

https://tartarus.org/gareth/maths/tripos/

https://www.maths.cam.ac.uk/past-examination-papers

https://www.maths.cam.ac.uk/undergradnst/pastpapers