I Am A Working Single Mother Seperated From My Husband

I am a working single mother seperated from my husband since last 5 years.My son is 8 yrs old in std 3, he does not copy any lessons from school, breaks his tiffin box almost every week, looses his pencils rubber, tears pages from his book,because of which I am unable to teach him properly & his grade has also gone down very low, He goes on dreaming in school at home very slow in everything he also tells a lot of lies sometimes its for no reasons.He is very interested in adult talks but forgets what he studies.Some times he behaves good & some times he does weird things.I am really very worried about my son. How can I cope with his studies & behavior does he need counselling if so could you please guide me some good child psychologists in Mumbai.