A big lie (Number 11)

It was the year 2003 and I was in my junior year in high school. The classes were finishing and I had to sit for five exams.
I wanted to go on holidays with my friends but I knew that if I told my mom that I had to sit for five exams she would not want me to go.
I usually don`t lie to my mon but this time was different, I NEEDED to go on holidays with my friends.
When I arrived that day to my house I looked at her and told that I only had to sit for one exam so she told me that there was no problem and that I could go with my friends.
But one week later she misteriously found out that I wasn`t telling the true.
I couldn`t go on holidays with my friends and I had to spend the holidays studying day and night.
That was the biggest and worst lie I ever told.