Hello student,

If you want to be a space scientist or if you want to study about space science or astrophysics you have to pass your 10 plus 2 level first. Actually 10th marks doesn't depend , if you get good marks in 10 level will get top level High schools.you have to complete your 10 plus two level with physics chemistry mathematics as the basic subjects. You should have a good marks your 10 plus two level. If you have enough interest in physics and mathematics in that level then only you should go for space science studies. After passing 10 + 2 level you can go to

Indian Institute of Space Science and Technology , Thiruvananthapuram

Each year they conduct a separate entrance examination you have to pass it. You also can do your B E r B tech degree from any top IIT in space science. You also can study astrophysics.