How to pass the value qLeft from ContentView() to structQuestions and then use the actual answer variable in Play().

//
//  ContentView.swift
//  Tables
//
//  Created by Shaik Arham on 01/08/21.
//

import SwiftUI
struct navModifier: ViewModifier {
    func body(content: Content)-> some View {
        content
            .foregroundColor(.white)
            .font(.custom("Helvetica",size: 40) .weight(.bold))
            .shadow(color: .green, radius: 3, x: 2, y: 1)
            .padding(EdgeInsets(top: 10, leading: 10, bottom: 0, trailing: 0))
    }
}

extension View {
    func navMod() -> some View {
        self.modifier(navModifier())
    }
}

struct Questions {
    var questionLeft: Int
    let questionRight = Int.random(in: 1...12)
    var actualAns = 0
    init(questionLeft: Int){

        actualAns = questionLeft * questionRight
        self.questionLeft = questionLeft
       }
}

struct ContentView: View {
    @State private var noQ = ["1", "5", "10", "all"]
    @State private var userQ = 0
    @State var qLeft = Questions(questionLeft: 0)
    @State var passV = 1

    var body: some View {
        NavigationView {
            ZStack {
                LinearGradient(gradient: Gradient(colors: [Color.yellow, Color.red]), startPoint: .topTrailing, endPoint: .bottomTrailing)
                    .edgesIgnoringSafeArea(.all)

                VStack {
                    Text("Settings")
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .padding(EdgeInsets(top: -20, leading: 20, bottom: 0, trailing: 0))
                        .font(.system(size: 30, weight: .semibold, design: .rounded))

                    Section(header: Text("Which table you wanna practice?")) {
                        Picker("Select Table", selection: $qLeft.questionLeft) {
                            ForEach(1 ..< 13) {
                                Text("\($0) Table")
                            }

                        }
                        .padding(EdgeInsets(top: -50, leading: 0, bottom: 0, trailing: 0))
                    }
                    .padding(EdgeInsets(top: 20, leading: 10, bottom: 0, trailing: 0))
                    .frame(maxWidth: .infinity, alignment: .leading)

                    Section(header: Text("How many questions do you want to answer ?")) {
                        Picker(selection: $userQ, label: Text("Select Questions")){
                            ForEach(noQ, id: \.self){

                                Text($0)
                            }
                        }
                        .padding(EdgeInsets(top: -60, leading: 0, bottom: 0, trailing: 0))
                    }
                    .padding(EdgeInsets(top: 20, leading: 10, bottom: 0, trailing: 0))
                    .frame(maxWidth: .infinity, alignment: .leading)

                    Section {

                        NavigationLink("Click to Begin",destination: Play(qLeft: $qLeft.questionLeft))
                          .font(.system(size: 30, weight: .bold, design: .monospaced))
                            .foregroundColor(.white)
                    }

                    Spacer()
                }

            }.toolbar {
                ToolbarItemGroup(placement: .navigation){
                    Text("Tables App")
                        .navMod()
                }
            }
        }
    }
}

struct Play: View {

    @Binding var qLeft: Int
    @State var questionLef = Questions(questionLeft: 0)
    var body: some View {
        VStack {
            Text("\(questionLef.questionLeft) * \(questionLef.questionRight)")

            Text("\(questionLef.actualAns)")
        }

    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

struct Play_Previews: PreviewProvider {
    @State static var qLeft1 = 0
    static var previews: some View {
        Play(qLeft: $qLeft1)
    }
}

Its working but why is the code below giving me errors 1. 'self' used before all stored properties are initialised and 2. Return from initializer withour initializing all stored properties.

struct Questions {
    @Binding var questionLeft: Int
    let questionRight = Int.random(in: 1...12)
    @State var actualAns = 0
    init(questionLeft: Int) {
        self.questionLeft = questionLeft
    }

    func calc(){
        actualAns = questionLeft * questionRight
    }

}

Don't use @Binding and @State in your struct. Those are for use in Views, not just any old struct. Remove those property wrappers.

And you will then run into an issue with your calc function, since you are mutating the struct inside it. You will either need to do this:

    var actualAns = 0

    mutating func calc(){
        actualAns = questionLeft * questionRight
    }

or this:

    var actualAns: Int {
        questionLeft * questionRight
    }

    //and remove the calc function entirely

Thank you a lot. Its working now.