Need someone to check over my code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HighLow
{
    class Program
    {
        static void Main(string[] args)
        {
            int numPoints = 1000;
            printRules();
            do
            {
                //numPoints = 1000;
                int wager = getWager(numPoints);
                int Prediction = getPrediction();
                if (isWin(Prediction) == true)
                {
                    //AddPoints(numPoints);
                    numPoints = AddPoints(wager, numPoints);
                    Console.WriteLine("You Win!!!!!");
                }
                else
                {
                    numPoints = RemovePoints(wager, numPoints);
                    Console.WriteLine("You Lose!");
                }
            } while (numPoints >= 0);
            Console.ReadLine();
        }
        /* Precondition: None
        * This method prints out the welcome message and rules of the game.
        * Postcondition: The message has been printed to the screen.
        */
        static void printRules()
        {
            Console.WriteLine("High Low Game!");
            Console.WriteLine("Welcome to the Game!");
            Console.WriteLine("RULES:");
            Console.WriteLine("Numbers 1 through 6 are low.\nNumbers 8 through 13 are high.\nNumber 7 is neither high nor low.");
            Console.WriteLine("You have 1000 points to wager. BEGIN!");
        }

        /* Precondition: numPoints is a valid integer
          * getWager asks the player to enter their wager.  It checks the validity of
          * the wager (a valid wager cannot be less than zero nor can it be more
          * points than the player currently has).  The method then returns the valid
        * wager.
        * Postcondition: A valid wager is returned.
        */
        static int getWager(int numPoints)
        {
            int wager;
            int timesPlayed = 0;
            //numPoints = 1000;
            Console.Write("Please place you're wager");
            wager = int.Parse(Console.ReadLine());
            do
            {
                if (wager > numPoints)
                {
                    Console.WriteLine("Not enough funds.");
                    Console.Write("Enter a smaller wager: ");
                    wager = int.Parse(Console.ReadLine());
                }
                else if (wager == 0)
                {
                    Console.WriteLine("You cannot bet 0 points.");
                    Console.Write("Please place a higher wager: ");
                    wager = int.Parse(Console.ReadLine());
                }
                else if (wager < 0)
                {
                    Console.WriteLine("You cannot wager a negative amount of points");
                    Console.Write("Enter a higher wager: ");
                    wager = int.Parse(Console.ReadLine());
                }
                else
                {
                    //numPoints = numPoints - wager;
                    Console.WriteLine("You currently have " + numPoints + " points left.");
                    timesPlayed--;
                }
            } while (timesPlayed == 0);
            //return numPoints;
            return wager;
        }

        /* Precondition: None.
          * getPrediction gets the player's prediction for high or low.  The
          * prediction must be either high (1) or low (0).  Validity checks are done
          * to ensure the prediction is within that range.  Hence, a 0 or 1 is
        * returned from the method.
        * Postcondition: 0 or 1 is returned.
        */
        static int getPrediction()
        {
        retry:
            int prediction = -1;
            Console.Write("enter your prediction for a high (1) or low (0) number: ");
            try
            {
                prediction = int.Parse(Console.ReadLine());
            }
            catch
            {
                Console.WriteLine("Please input numbers only.");
            }
            if (prediction != 0 && prediction != 1)
            {
                goto retry;
            }
            return prediction;

        }
        static int AddPoints(int wager, int NumPoints)
        {
            //return NumPoints * 2;
            return NumPoints += wager * 2;
        }

        static int RemovePoints(int wager, int numPoints)
        {
            return numPoints -= wager;
        }

        /* Precondition: thePrediction and num are valid integers
          * isWin will return a boolean as to whether or not the player has won their
        * bet. A win is defined as the following:

          * if the player bet on low (0) and the number is less than 7, win is true
          * if the player bet on high (1) and the number is greater than 7, win is
        * true
        * otherwise, win is false
        *
          * Postcondition: True is returned if the player has won; false is returned
        * otherwise.
        */
        static Boolean isWin(int thePrediction)
        {
            Random Rand = new Random();
            int Guess = Rand.Next(1, 14);
            if (Guess > 7 && thePrediction == 0 || Guess < 7 && thePrediction == 1)
            {
                return false;
            }
            else if (Guess > 7 && thePrediction == 1 || Guess < 7 && thePrediction == 0)
            {
                return true;
            }
            return false;
        }

        /* Precondition: The game is over.
          * finalMessage prints out 1 of two messages.  One is if the player has no
          * points left. A message indicating so is printed.  Otherwise, the amount
        * of points is printed to the screen, with a farewell message.
          * Postcondition: A message indicating no points OR points remaining is
        * printed to the screen.
        */
        static void finalMessage(int thePoints)
        {

            {
                if (thePoints <= 0)
                {
                    Console.WriteLine("Not enough funds.");
                }
            }
        }
    }
}