https://pcpartpicker.com/list/dNXVTH
1300 is a lot. You can do it for less. I assume CAD is cpu bound so I went with an R7. Great multi thread. You could easily save with a an R5 1600. Note I did not include monitor keyboard mouse or OS since most people already those and the OS as a student you likely get a discount or free.
Even with my list there are places you can save.
Cpu- r5 is a six core 12 thread cpu vs the 8 core R7
Ram -could drop to 8gb
Case-purely subjective. Cheaper cases
Memory-might not need an ssd