Here are my answers to a few questions that people have asked this week. Sorry if I couldn't answer every question; it's been a busy week!
1. Are "first of all" and "at the first stage" better than "firstly"?
It won't make any difference to your score if you use "first of all" instead of "firstly" in your task 2 essay. "At the first stage" is completely different; only use that when describing a process in writing task 1.
2. Why was the examiner writing notes during my speaking test?
Don't worry about what the examiner was doing. Examiners often take notes, and it doesn't mean anything bad.
3. What structure should I use if I disagree with both views in a "discuss both views and give your opinion" essay?
Just state your opinion (that you disagree with both views) in the introduction and conclusion, and discuss both views in the main body paragraphs. The question doesn't tell you that you must support one of the views, but it does tell you to discuss both.
4. Can I write both a summary and a conclusion for writing task 1?
You can, but it's really a waste of time because you will probably repeat yourself. Forget the idea of a 'conclusion' for task 1, and simply write an overall summary. Put your summary either straight after the introduction or at the end of the essay; I prefer to put it after the introduction, but it makes no difference to your score.
5. If my speaking part 2 topic is "describe a memorable event", is it ok to describe a sad event?
Yes, that would be fine.