It is in the best interests of the religious leaders of the country (and also political leaders) to keep education levels low. If people really understood what was going on there would be a revolution. It's like under the Dutch, after 1901 they started to educate tens of thousands of Indonesians in Holland, the result was that they realised what colonialism really was and these newly educated Indonesians provided the momentum to independence.
On this, I totally agree. I am not a conspiracy theorist but it looks like there is a secret agenda to keep the masses down, uneducated and religiously indoctrinated, otherwise, you cannot run the show. Also, trendy authoritarianism in Indonesia would require dumber citizens.
There are excellent opportunities for the elites, though: there are good high schools in Indonesia, but universities for them are later in Malaysia, Singapore, US, Europe. Only the elites and upper-middle class have to have access to education, so the prols can stay on the bottom without complaining. Public schools, on average, are literally producing dumb kids, and they do not even understand how much they know about nothing.
Somebody could compare that to the USA, but it is simply not true. In the US 10-20% of the population are running the remaining 80-90%, while in Indonesia 0,1% is running the 99,9%, without any chance for social mobility for the poor but capable to climb up the social ladder.