Should I buy Arduino as a Computer Engineering Student?
It depends. If you don't have any knowledge about microcontrollers it might be useful.

However, Arduino hides a lot of concepts in their libraries. If you want to go more indepth check other systems like STM32 or PIC.

You also can do both, start with Arduino to get a rough feeling, continue with another.

More important is WHAT you try, don't stop with LEDs/switches, but check communication protocols like SPI, I2c, UART etc. And learn what timers, interrupts etc. are and how to use them.