I know many formulas for it, basically memorized, because I simply cannot figure out circuit logic by myself, so on tests, I have to just plug in formulas basically.

My main question is, what are the main differences of BJT and Mosfets?

I know some differences, like BJTs seem to have lots of current, but MOSFETS seem to absent of any somehow. Different formulas as well.

My problem is really, whenever they ask a question about MOSFETs and BJTs, and show an example of a similar situation I can do it, so I do the homework well. But then on the test, they change up the question or circuit so that it looks really weird or crazy, and then I get lost. I don't know what to do next etc.

As a comp eng, I dont know why they teach us so much electronics, but I bet it gets worse for elec engineers, i feel upset for them .

 

Hello,

The main difference is that a bjt is current driven at the base and a mosfet voltage driven at the gate.
Here are two pages of the EDUCYPEDIA, one for bjt transistors and one for mosfets.

http://www.educypedia.be/electronics/composemiconductors.htm
http://www.educypedia.be/electronics/composemosfet.htm

A lot of information can be found in the links of these pages.

Greetings,
Bertus