Dear balbahadur,
Send the invitation letter from your school; if you have scholarship and working at the university, also send the original copy from your school; your own letter of invitation; the statement that you are in good standing in school; your transcripts; property evaluation back home; if your parents do have some money in the bank account, please prepare the statement from the bank too; your parents' social tie to Nepal so that the consulates are confirmed that your parents will return to nepal;
I hope this helps!