Alright, I want to start on the project, but I need to get a kick-start fund NOT FROM DONATIONS. My reason for this is because someone could scam others using this scheme, so I'm using the leaf-blower to earn some cash to do this.

http://www.kickstarter.com/

If you can create a good pitch and decent reward tiers, kickstarter is an excellent site to raise funds.

Wouldn't that be called a smartphone with a math engine ?

http://www.kickstarter.com/

KickStarter is generally for 70%+ projects. In fact, rules forbid you from posting a project that is not "solid" yet - only pictures of prototypes are allowed, not mockups or renderings. You will not get a single supporter until you have a working product that just needs polishing. If you really need money, I suggest Indiegogo for raising money.

A few comments about this project:
1) Cheating
I'm not going to try to be nice here - cheating on the SAT (or attempting to) is stupid. Really, really, stupid. You're gaining an unfair advantage against me and others who have taken the SAT fairly. If you got a higher score than me from cheating, I or some other person might not get into my/his/her favorite college. Furthermore, cheating makes no sense. If you don't know it, you don't know it. Once you get into college, if you've cheated, you will almost immediately fail high level classes.

As for making a calculator, do you really think CollegeBoard/ACT is stupid? They manually approve calculators each year, and I don't think they will smile when they see that you've tried to sneak in a QWERTY keyboard. Or any of your "clever" ideas to work around their regulations.

Trust me, cheating is NOT worth it. If your only goal is to make a calculator to cheat with, I don't even want to see you in the SAT testing site. Colleges have ZERO tolerance for cheating in any way, shape, or form. If you cheat, and you're lucky, you can get a hand slap. Most of the time, it results in expulsion.

If you're building a calculator for FOSS(+HW) reasons, I'm very happy to support this project. With enough time and inspiration, you can probably build a better calc than I (OTCalc) or any others have tried. But DON'T build it for cheating. Not worth it.

2) Android
You're just begging for the SAT guys to ban your calculator, eh? Android is a smartphone OS - it does not belong inside a calculator. It needs a touchscreen for it to be really useful, and touchscreens are almost certainly banned by testing organizations. Furthermore, Android isn't exactly a platform for that kind of development. You shouldn't be sending email, be on Facebook, etc. using your calculator (or at least, not in such an obvious way).

My suggestion: go with just simple ol' Linux. The Angstrom Distro is a very nice platform to start with. If you want fancy animated effects, SDL (or Clutter) can be installed and used. GUI? Qt or GTK. CAS engine? Too many to count. You have an infinite range of options, but definitely start with something simple.

3) Feasibility
What are you prototyping on? What's your target hardware? (CPU? RAM?) What's your target price? Who's your target audience? Those are very big questions that I haven't heard you answer yet. Hardware always comes before software. If you don't develop the hardware, the only places the software will run on are your computer, or your development board.

If you're building a calculator for FOSS(+HW) reasons, I'm very happy to support this project. With enough time and inspiration, you can probably build a better calc than I (OTCalc) or any others have tried. But DON'T build it for cheating. Not worth it.

What happened to OTCalc?

I'm sooo sorry I haven't gotten a prototype yet, I'm just not making enough money. I really want to start working on this. Unfortunately indiegogo requires a minimum goal of $500 and I only need about $100 to get the project started and I don't think $500 will be reached and also, I don't want to rip anyone off. If you think that the $500 goal is fine, I'll consider it.

PS. About kickstarter, it requires a minimum age of 18 and I'm still 15 so I'm immediately disqualified from that one. Luckily, indiegogo has no minimum age.

Reply to Rhombicuboctahedron: Sorry, but stylus is not allowed on SATs. I'll probably include a touchscreen, but if you want a pen, you'll need to get it separately (Touchscreens are allowed, styluses are not)

PSS: Do you know where I can find a calculator keyboard that connects to raspberry pi? I'm also thinking of locking down the OS due to popular demand. You will still be able to bypass it by finding the Easter-egg (or flashing a new ROM of course) but at stock, it'll contain plenty of math apps, and will be able to install apks through file explorer (because all current calcs can install apps so there's no bad in having this feature) , but I will lock wifi and hide it somewhere to prevent the use of facebook and stuff. (There very likely will be root as well)