Школу можно окончить и в 16 лет, но

Школу можно окончить и в 16 лет, но, если вы хотите учиться в университете, нужно продолжить обучение до 18 и получить за все предметы «отлично».

Результаты (английский) 1:

School can finish in 16 years, but if you want to go to university, it is necessary to continue their studies up to 18 and get all of the items as "excellent".

Результаты (английский) 2:

You can graduate from school at the age of 16, but if you want to go to university, you need to continue your studies until 18 and get for all the subjects "excellent".

Результаты (английский) 3:

You can graduate at 16, but if you want to go to college, you have to continue to study until you are 18 and get "excellent" in all subjects.