Do i need to but a new sample paper book of maths .As the one i have is of my brother from year 2009-10 and while solving didnot find any difference and i checked the marks distribution was of marks , 4 marks and 6 marks another for conversion/ differential tests in chemistry in organic during my preboard i did it in two step but it was correct but didnt get any marks when i asked my he asked me to write one step reactions .eg differention between hcooh and ch3cooh first I reduced them to aldehydes and then did haloform test.which is correct too when i said that he like pounced in me .Is it valid if I write in boards another in physics the derivation of compound microscope I wrote according ncert but my sir wanted a different one which was genuinely much more better what should i choose

Do i need to but a new sample paper book of maths  .As the one i have is of my brother from year 2009-10 and while solving didnot find any difference and i checked the marks distribution was of marks , 4 marks and 6 marks

 

another for conversion/ differential tests in chemistry in organic during my preboard  i did it in two step but it was correct but didnt get any marks when i asked my he  asked me to write one step reactions .eg differention between hcooh and ch3cooh 

first I reduced them to aldehydes and then did haloform test.which is correct too when i said that he like pounced in me .Is it valid if I write in boards

 

another in physics the derivation of compound microscope I wrote according ncert but my sir wanted a different one which was genuinely much more better what should i choose