do you have to choose level 2 electives when you're in level 2 ?

No, you don't.

You can take any electives that you have the requirements for. Most are OPEN courses and don't have requirements. Some require you to be in Level 2, etc. Some you may need to be in a particular faculty. Just make sure to check what it says under 'requirements'

Though it's important to note that most programs have a maximum number of level one units you can use as electives. Check the course calendar for your program!

so as long as i don't exceed the maximum number of level one units it's still ok to take another level 1 elective even though i've finished two level 1 electives?