Isuffer in classes whenever i take a test which is timed. sometimes i skip questions by accident when i am trying to finish easy questions first and other times i just work fast trying to finish easy ones first then hard ones and later end up with neck ache and headache? what should i do like what's your advice?

Take deep breaths and relax.

I would say don't rush take ur time and if u skip over questions u should write a note and put it to the side saying, the numbers that u need to go back to or saying don't forget to go back to so and so. Also on the working on the easy ones at first and then the hard ones, if i were u i would do the hard ones first that way if u loosing time after u can answer the easier ones last. This is just what i would do i hope this is good advice and that it helps. And pray before u take the test and i hope for the best