I have been teaching mathematics for 7 years using Cambridge and National (Indonesian) curricula, ranging from students aged 12 until 18 years old. I would like to help people who have difficulties in mathematics by discussing difficult questions through email and also by giving the key words in solving problems relating to mathematics so that you will have a better understanding in mathematics. In addition, I will also try my best to explain using a different method so that you can understand easily, especially for difficult topics.