YOU MUST PASS THE PRIMARY SCHOOL TEST IN ORDER TO PROGRESS TO THE SECONDARY SCHOOL, SO, IM SORRY, SKIPPING THIS IS NOT AN OPTION
Taxation:
Ideally you want to raise your tax rate to 28%, collect taxes and then drop your tax rate to something around 10%.
Basically, you raise your tax rate to 28% before you collect taxes, thus gaining the maximum amount of money possible for tax collection and then you drop your tax rate to around 10% to keep your population as happy as possible.
Ps: Remember to raise the tax rate back up to 28% each time you collect taxes and then drop it back down again
Governments:
You should pick the government that your people want (it gives a description next to the current symbol as to what they want), no government is vastly better than any other, but if you can, you should make your nation a monarchy as it provides the most bonuses.
However, if you intend to go to war or find yourself involved in a war, set your government to communism as it reduces the chance of your nation falling into Anarchy
Religion:
There is little to say about Relgion, no religion is better than any other, just pick the religion that your people desire in order to keep them as happy as possible.
Happiness:
The happiness of your nation's citizens is key to the success of your whole nation. Low happiness = less income, very poor happiness = rioting and anarchy.
In order to keep your population as happy as possible, give them there desired government and religion, keep taxes low (when not collected them). don't have a giant military (have a moderate one, as a giant military scared your populace), keep popualtion density low and continuously expand your infrastructure (to increase the literacy rate and provide better facilities).