REGARDING NPTEL LECTURES
1.GO ON WEBSITE NPTELONLINE COURSE 
2. SEE AT TOP  RIGHT HAND SIDE LOGIN CLICK ON IT 
3.YOUR EMAIL ID SHOW THERE  THAN CLICK ON IT THAN CLICK PROFILE 
4. AFTER THAT YOUR DETAILS COME  THEN GO TO BOTTOM YOU SEE YOUR SUBJECT  IN WHICH YOU ENROLL
5. THEN CLICK ON PROGRESS   AND YOU REACH TO MAIN SUBJECT PAGE 
6. THERE IS VARIOUS SECTION WEEK 1 INTRODUCTION ... AND SO ON  CLICK ON ANY THEN YOU SEE VIDEO 
7. IN SAME SECTION THERE IS ASSINGEMENT SECTION  CLICK THEN FILL THE ANSWER AND SUBMIT
BUT BE SURE  BEFORE LAST DAY YOU SUBMIT THE ASSINGEMENT OTERWISE CANCEL.    course outline > week 1 > lecture 1 : intriduction   
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Follow above steps.