What's a cheap computer that can run minecraft decent?

I'm looking for a computer that can run minecraft and maybe cs go but mainly just minecraft at about 40-60 fps and can also be used for school work I I would prefer to keep it $600-$650 but I can spend up to $750 I would prefer pre built because I don't know much about building a pc and I'm afraid I would break a part or build it wrong but I'm willing to try building one since I have a friend who built one before

Being dead serious. Building a computer is about as hard as tying your shoes. The only trick is figuring out where to put the dollars so you get the most out of them. There are so many youtube videos that will walk you through building a computer it's not even funny. There are probably more gigs of video data on building computers now then gigs of data in EXISTENCE 20 years ago. You will get so much more out of building your own computer than you can begin to realize. The single biggest benefit is knowing exactly what's in there. If you go to the store to buy more ram and the guy says to ya "What kind of ram?", no longer to you have to scratch your head, and go, "Ahh, it's a Dell, I know that, and it has an Intel something or other…".
Wouldn't it be nice to say "Well, I have 8 gigs of DDR3 1600 now running CAS 9, but I'm looking to get 16 gigs of DDR3 2400 at CAS 10 or 11… You got any of that?" You know exactly what's in there because you put it there. You also get something with a home built computer called a "warranty". Oh, I know, pre built computers come with a 1 year warranty. Ya hoo. Every part in my computer is warranted for 3 years at LEAST. Some parts for life. Think you'll get that with a pre-built? Nope. 1 year is what you get, no matter what fails.
All I'm sayin is that, if you have $750 max to spend (and I heartily recommend pushing every dollar you can into it), you will get the MOST for your dollar if you DIY.

Start with a platform (I recommend Intel i5 on a socket 1150 platform for your budget range. The 4690k is nice). Pick a motherboard, pick a case, pick a cpu, pick a power supply (here is where money is well spent), pick a hard drive, optical drive, ram, video card, and whatever version of windows your heart desires.

Then put it all together. Once you've made this quantum leap into the "computer enthusiast" world, the rest is baby steps. SLI or Crossfire? No sweat, water cooling? Sign me up. Overclocking? Crank it.

Come to the light side. We're always looking for new jedi.