i got www . istudent . ws does someone know how can i change for what about same relevant information ? i mean com is nearly impossible so what can i do ?

This question makes no sense, I think you need to rephrase it.

I don't think you have much choice here. I would recommend looking at .net and .org but they are most likely taken as well.

.ws could be successful, but you just need to work even harder to promote than if it were a .com.

Domain is just one of important factor in positioning but it's not everything. You can also position .ws domain without big problems