Is it possible to become GM without coaching ?

Saying you want to become a GM is like saying you want to become an A+.  They are something that you achieve.  You achieve the GM title, you dont become a GM title.

No! You shoudn't do this! If there is a geometric mean of 3 moves per turn that you need to study (since you're saying that you want to study *all* the moves, even moves like h3 and a3), I did a little calculation, and if you memorized 1 move per second, it would take you over 30000 years to memorize those moves!

Instead you should try to get to 1600. Ask the players 1600+ how they got to that rating, and learn from them!

Good luck! You can do it

(Even if you don't manage it, and instead get to 1700 instead, that's a big achievement! That's how you should approach improvement)

in all honesty, dont think so. with the age of engine, the game has been made virtually impossible to be a high rated player without some sort of training. maybe in fischer's day it might've been possible

Possibly of interest:
https://www.chess.com/article/view/can-anyone-be-an-im-or-gm
What It Takes to Become a Chess Master by Andrew Soltis
https://web.archive.org/web/20140708093409/http://www.chesscafe.com/text/review857.pdf
100 Chess Master Trade Secrets by Andrew Soltis
https://web.archive.org/web/20140708094523/http://www.chesscafe.com/text/review916.pdf
Reaching the Top?! by Peter Kurzdorfer
http://www.thechessmind.net/blog/2015/11/16/book-notice-kurzdorfers-reaching-the-top.html
http://www.jeremysilman.com/shop/pc/Reaching-the-Top-77p3905.htm
What It Takes to Become a Grandmaster by GM Andrew Soltis
https://www.chess.com/article/view/don-t-worry-about-your-rating
https://www.chess.com/article/view/am-i-too-old-for-chess

I've had a lot of interactions with the OP and I can confirm that he isn't trolling. He really wants to become a GM.

My worry is that it isn't a wise thing to do. To be a grandmaster involves an enormous amount of work with very little profit. Any successful grandmaster at the moment achieved that title in their teenage years and still work hard to keep at the top.

All that effort into something else, say medicine, engineering or science could be useful to yourself and society, while still keeping a strong interest in chess.

lol so apparently since he said he'd be 1800 on 2/13 he has 4 days to go up 300 pts

Although it seems like it was possible at the time, the truth is that chess improvement is often far far more difficult than some think it is. 

The deadline is here... 

His rating not moving in a month makes his gm in 3 year gm in 2 years and 11 months. Maybe in a year we will see his attempt at 1500 to gm in 2 years

Another delusional troll. No, you will never get to 1800, let alone a GM. 

Of course it is possible to become a GM without coaching. 

It's violin, not violine you illiterate donkey. 

I wouldn't go so far to say that he could never become 1800.

But certainly not 1500 to 1800 in a month, or even a couple of months. In a year? It's possible.

The point is, the attitude of players trying to "become GMs" should follow a step by step approach: first be 1800, then 1900, etc. etc.

Sohum should be setting reasonable goals, which 1500 to 1800 in one month (although I supported him, and really wanted him to improve that quickly) was not.

He will never get to 1800 not because it is impossible, but because you can clearly see he is nothing more than a delusional troll. Even to get to 1800 you have to work, you have to spend time doing mindful practice and after some months you may get there. 

But this guy will not do anything of that, I can guarantee it. 

Problem is that  asking "how can I be a Gm" (when you're already a grown up and obviously are extremely far from that)  is like when average Joe, 25 years old, being a bit  into sports but not that much, asks "How long I 'll have to train before I benchpress 440 lbs; I DO know that WR is 738 but 440 will be ok"...
OP you'll never never EVER be a Gm. In the unlikely case you're not heavily trolling, the best thing that could happen to you is that you meet in person players above 2200+,  masters or even Gm and get beaten brutally hundred of times by them.

lol u ppl are so mean

your valentine will be so disappointed today ...