Since you applied for two different categories of visa in a very short time it does show some immigrant intent. They think that since you were not able to go in tourist visa you are trying to go on a student visa. Try again in Student visa that may show that you are really serious about studying and your non immigrant intent.  They are just testing you.

Also Show your tie towards nepal like financial ie properties and work documents, bank statmenets etc , emotional ie families  etc.  And don't give up. Try again and again you will get it.