Practise more and more book .

Take tuitions 

Clear your doubt from your teachers , friends or net etc.
1 5 1
these are only steps
lakhmir singh also give better explanation
bhai, it is hardly for me to cramp, I can handle physics but it tough to chemistry as physics is easy
please guide me
steps are easy and hard also
By writing and learning reactions many times. try this because my sister is also in 12th she also do the same way and now she is scholar in chemistry .
hoped i help u 
2 5 2
ok now u have to start to write what i had wrote in answer
by writing and learning reactions many times
thanks a lot