The episode starts with a dream..
Dreams are actually manifestations of what we truly desire the most.. If we keep on thinking about something day in and day out, it becomes a part of our subconscious and we dream about it..
Anokhi's dream shows how badly she wants it, her actions in reality (not being able to concentrate on the fun activities with her friends) show how much she is dedicated to it.. She can't relax and enjoy even if she shuts down her lappy, her mind and heart are in her studies and she can't enjoy anything else apart from it..
She dreams about running away in a train, she wakes up with a train's horn.. It shows how badly she wants to escape the place, her own house.. Home is the safest place for any person but it seems all her dreams center around running away from it- her unsafe place..