Everyone has own weak points and I am not an exception. It seems stupid but beeing a mathematician by my first education I feels myself not confident enough with numbers and sheets. Actually I hate it. It makes me crazy and now it is the one of things I have to do working with students. It`s hard to me to estimate their knowledge because I am sure the marks system becomes out of date, it made students nervous and demotivated to make new creative decisions… and so it is the uncorrect way to estimate modern people. Damning system! But it is still alive. Hopes it will die, it must kick off!!!