IELTS grammar: By, Until, With.
Sometimes students make simple grammar mistakes when speaking or in the essay writing part of the test. IELTS examiners mark you on the accuracy of your grammar in the speaking and writing sections of the test. Grammar makes up 25% of your marks in writing and speaking.
I advise focusing on accuracy when writing and speaking because even if you have a wide range of grammar if it is used incorrectly you will lose marks. Below is a short lesson on how to use the prepositions By, with, until.