The United States has some of the best universities across the world with the top institutions such as Stanford and Harvard featuring in most prominent universities. However, gaining access to United States universities are not as easy as to the United Kingdom.
The United States prefers admitting students by age ie fresh from form four where a person who has taken more than 3 years after the KCSE exams would find it very difficult to access the USA education system. One major advantage the USA education system has over the UK based one is that of the existence of very many community colleges in the USA that can act as the bridging to gaining access to the main universities.
However, a person who has been consistent with his/her education such as after form four, he/she acquired a degree would find it slightly easy to gain access to the USA education system.