Developer's note; I can't tell for sure but it looks like the multi-click upgrades that you can buy from the shop also apply to when you're going to school, at least time wise. The money deduction is the same, but the education grossly increases. Could be wrong.
Tips: End of the year you will be taxed for 18% of your TOTAL assets. When it comes you want to do one of two things. 1) $>200K, just take the 40K hit and make your money back with the stock market. 2) If you have less or you aren't paying attention, buy out anything you can to reduce the amount wasted from taxes.
The different stocks have general trends. Ex. PINK will cap out at about 2800~ before resetting down to ~1300. When you see it anything less than 2500, buy it up, then come back in a while to sell it before it drops off.
When you've made your first million, your best bet is playing off of GMS, LUX Trade, and the ACC one. Each are predictable, and at that point it's less about the big changes and more about the 40K iterations of $1 changes.
The computer is designed to be a step ahead of you in education, if your goal is to beat him just ignore it, similarly true if you are actually playing as an idler, the clicks don't return enough compared to stocks.