Hello, Mr. Ahmed Omar, I have been a mathematics teacher for more than 19 years, during which I taught all branches of mathematics. I have students from different countries of the world, most of whom are from America, Canada, Australia, and Turkey. Saudi Arabia, Qatar, Bahrain, the Sultanate of Oman, and Kuwait achieved excellent results with them, and they are still continuing with me. I invite you, my dear brother, to attend a trial session.