I agree with Zarathu and RosieOne. There’s no justification. We fail the studies when we don’t work. Period.
However, the first thing I noticed about your chart is that you had no major oppositions, only squares. This often shows that a person is likely to trim the sails and ride the waves. He avoids anything that he considers to be pressure, unwanted obligations and taking responsibility. Usually, such a person will find a way out and more often than not it’ll be on someone else’s back. Not that it’ll make him happy in the end. I’m not saying that it is entirely your case. But as you said, your parents paid a great deal of money for that school.
One of the aspects that can result in laziness, if we don’t work hard to deal with it, is Sun square Neptune. It blurs the picture and a person can’t clearly see himself, others or tasks that must be performed. Not to mention its push towards all sorts of escapism (TV, books, video games, drugs, alcohol…). This is accentuated as the Sun is placed in your 1st house. Another aspect that works in the favour of such a negative spent of energy is Neptune square Mercury, because Mercury rules your ascendant – Virgo and it is the planet of communication, school etc. This aspect can affect your speech, make you less clear to others and it gives vivid imagination, but also blurs the reality.
What’s the cure for this problem? The thing you lack is self-discipline. Try small steps. Make lists of tasks you must perform. Be sure that you clearly understand what you must learn, write or do. Always set deadlines and stick to them. Be realistic. Don’t ask the impossible. Set attainable goals. Always have a calendar before your eyes.
If you haven’t got any learning disorders, even in a borderline form, just by being aware of your wrong patterns can be motivating enough to start changing them. It’s not enough to know that you’re lazy; you have to understand how this works and why so that you can help yourself. However, if you feel that you may have learning difficulties consult your doctor and find help.
I would also like to point out that the choice of your studies can contribute to the problem. Not that I justify your irresponsibility. The ruler of the 9th house, Mars, is placed in the 5th. You should ask yourself if you have any interests in art or anything creative. However, be ware that such professions ask even higher levels of discipline, the very thing you lack, because no one will push you to write, paint or perform; you have to be your own motivator.
Don’t lose hope. You’re very young and you have time to work on your weaknesses and find your strengths. I couldn’t help noticing your country of origin. It’s going through a rough period. No matter how difficult the economical situation can get, it’ll pass. Concentrate on creating a new disciplined structure for your mind and the results will come. Don’t run from hard work and responsibility. Embrace them. Do something that you don’t feel like doing every day. If you chose to continue with your old way, you’ll feel inadequate and unhappy.
Good luck!