I'm not sure why it would fail to compile but I can spot a logic error in your test method.

count: count+1

should be:

count: this.state.count+1

or better yet:

count: this.state.count++

This is because you need to remember to reference the instance of the class Profile using the "this" keyword. This is necessary because any assignment needs to reference the explicit path the count variable is stored at, i.e this.state.count.

see if this does anything for you :)

import previous state, also dont mutate the this.state variable outside of the constructor function, use this.setState in the test function, this will also rerender the component

import React from 'react'
export default class Profile extends React.Component{
    constructor(){
        super();
        this.state={
            name:'Abdur Rehman',
            email: 'abdur@gmail.com',
            count: 0,
        }
    }
    test(){
        this.setState({
            ...this.state,
            name: 'Jamal',
            email: 'jamal123@gmail.com',
            count: this.state.count + 1
            }
        )
    }
    render(){
        return(
            <div>
                <h1>hello {this.state.name}</h1>
                <h1>Email: {this.state.email}</h1>
                <h1>Count: {this.state.count}</h1>
                <button onClick={()=>{this.test()}}>Update Name</button>
            </div>
        );
    }
}