Of course a score of 1850+ is possible for you!
To increase your Math to the 600 and above mark, I would recommend the book PWN the SAT: Math, and then I would suggest Barrons Math Workbook. For the CR, I would say Barrons Critical Reading Workbook and for you to read higher level things. For the Writing, understand the 5 basic grammar rules: parallelism, subject verb agreement, misplaced modifiers, subject pronoun agreement, and pronoun verb agreement.
It all comes down to studying, practicing, going over AND understanding what you had wrong.
Also, if you feel that the SAT isn't for you, I would suggest looking into the ACT.
It's more than possible. So, you can do it!