Hi @Han00, the fundamental skill in writing essays efficiently is to read more, be it newspapers, dictionaries or magazines, reading should be practised as a hobby. The reason is that reading helps you to boost your vocabularies and it also allows you to expand your knowledge, hence your writing skills are as well developed effectively.
If you don’t have time to read, you don’t have the time (or the tools) to write.
Simple as that. -Stephen King