Here are a few useful questions that people have asked me this week:
1. Are writing tasks 1 and 2 examined by the same person?
2. Can you do a writing task 1 lesson about how to describe the 'shape' of lines on a graph?
Personally I rarely describe the 'shape' of a line. Instead of following the trend of one line, it's much better to compare two or more lines at a particular point. Have a look through my task 1 lessons to see how I describe changes and make comparisons. I don't think you need to learn any other 'shape' or 'trend' language.
3. Can you do a lesson about how to use prepositions?
I'm afraid that 'how to use prepositions' is a HUGE area, and I won't be able to explain it here. It's one of those things that you have to learn gradually. In fact, it's better to treat that area as 'vocabulary' (that you gradually learn) rather than 'grammar' (that someone can explain).
4. Can you do a lesson about 'low, less, little, few, much, more'?
This is another big area, and a dedicated grammar book or website is the best place to read about that kind of thing.
5. Is it better to use 'he' or 'she' when writing about a person in general?
I would try to avoid choosing between 'he' and 'she' by using plurals (e.g. they) and alternative words (e.g. individuals, employees). For example, instead of writing "when a child starts school, he learns...", you could write "when children start school, they learn..." or "school pupils learn...".