Here is a plan that the author says should get you to about 1800:
http://www.gautamnarula.com/how-to-get-good-at-chess-fast/
He says:
"play a lot, analyze your games, and primarily study tactics. Your knowledge of openings, endgame, middlegame, etc. will come from analyzing your games and going over grandmaster games. Only study one of those specific topics if it is clear you are specifically losing because of that topic"
I have a guy in my area that pretty much just went over a lot of GM games from books over the Summer a few years back. One of his first tourneys after that he won the reserve section of the tourney and went up 200 points.
Do you believe that your USCF rating of 1406 is accurate? I don't believe that it is, so my advice is that you shouldn't overestimate what needs to be done. The last thing that you need is to overwelm yourself. Other than that I can't offer much. I have never studied or taken the game seriously.
June is almost over and my USCF rating is at 1406. My goal is to be playing like an 1800 by the time the first rated tournament of the 2015-2016 school year comes around in mid-September. That means that I have almost three months to improve my playing strength by about four hundred rating points. I have plenty of time on my hands due to the fact that summer vacation is not even close to being over. The problem is that I do not know what study plan to follow that will allow me to reach 1800 in three months.
The areas I really need to improve in are tactics, knowledge of opening theory, positional and strategical ideas in the middle game, and endgame skills. In other words, I need to improve in every way I can. Please help me reach my goal by giving me recommendations on how to improve, how much time to dedicate to each topic, and how to come up with a formulaic and efficient study plan! Ideally, I would come with one that looks similar to the chart below except with a certain amount of time in each empty slot:
endgame skills
If I successfully come up with an excellent study plan, I will have no problems reaching my goal!