If you get 90% marks here you will get in exam as well. If you are at this page it means you have taken science subjects. We must tell you that science has changed our way of life and brought about revolutionary changes. JusT take the example of mobile phone, a small device which you carry around and talk to anybody in the world any time. Behind is the computer and software's developed for this purpose. If you work hard and get good marks, you may invent things even better