Is it possible to clear 9 back papers plus my final yr 6 papers i.e. total 15papers on my own in 6months.?

hi.I am in my final year of my biotech graduation course.I was through extreme depression for last two years.Was not thinking to live till my graduation ends.Things had become extremely awful for me in last two years.I was struggling hard just to make through another day.Sounds dramatic.But that was my reality.My parents are of no help.I was psychologically ill and needed help but my parents r too conservative n insecure people who would never agree to my meeting a psychiatrist.So had to deal all my fears and insecurities alone.Am not even safe at my own home with a -obsessed elder bro who is thankfully not staying with us anymore.Things has happened with me which i cant even bear to think nor tell.I tried telling my parents but they were incredibly hostile so i did not try anymore.cant tell 2 my friends as m their problem-solver and not the other way.At my college we are not allowed to retake CLES those subjects in which we failed i.e. we have to prepare on our own.m too chicken for suicide or taking any action against anyone.ALL I WANT IS TO P OUT WITH GOOD MARKS AND GET A GOOD JOB.AFTER THAT I WANT TO DEAL WITH THE ABOVE THINGS.BECAUSE NOW I HAVE GOT NO ONE WHO WOULD SUPPORT ME.SO I HAVE TO FIRST MAKE MYSELF INDEPENDENT.Dont even think about teachers help.This course was opened just two years back.teachers were not available for this course.so they made botany n zoology teachers take our cles and they had no idea about the course.only 20 students r in my batch.none of us was able 2 score well 4 last two years.and the principal is an old crone who is just not interested in who teaches what.our seniors career was about to get destroyed thanks to them coz they did not even give out marksheets to the seniors and becoz of this seniors missed the marksheet submission date in various universities.So from this u can know the plight of my college.All i have is myself i.e. i have to prepare on my own.but still i went 2 my course teacher 4 help snd she told me to read from online.wow.plz help.plz tell me how to study.and plz tell me how to p in maths.