I'm just a student of grade 11 but, I was interested in knowing about Physics much deeper. In order to start my interest in Physics, I watched this video of Quantum Physics NOVA : Quantum Physics(NOVA)
I have some questions in mind :
$\bullet$ Is Quantum Mechanics also applicable for massive objects like Human Beings, Animals etc. (in comparison with the small atoms) ?
$\bullet$ How much does Quantum Mechanics affects the rules that we have studied yet, like in Newtonian Mechanics and Classical Mechanics ?
$\bullet$ Has Quantum Mechanics been successful in defining the movement of atoms and other negligibly small objects like sub-atomic particles etc. ? Or is there something yet to come...?
$\bullet$ While, I know that any theory is simply NOT based on calculations or only on experiments. Has Quantum Mechanics been able to define all the rules with the help of Experiments etc.?
$\bullet$ As a student, I'm basically confused that which theory is the most accurate and applicable in real life. So, which theory is the most accurate and applicable to the reality?
$\bullet$ After watching the video (linked at the start), I was not able to conclude whether Quantum Mechanics is based on accuracy or on probability ?
$\star$ I'm sorry, I understand that these questions are much broad and may be concluded as foolish or meaningless questions, but, as a student these were the questions which came in my mind. I will appreciate a lot if anyone can help me in clearing my doubts!