Question

why is it often our parents saying that 10th standard is a major part of our life

Answer 1

because the result of 10 can change the path of Ur life as it determines the stream u will choose and all Ur hardwork that u did stating from Kindergarten to tenth will be reflected by the result of Ur tenth

Answer 2

It is because it decides our future as if we get good score in 10 standard, it will form basis for 11 and 12 class. Because which stream you want is all depends upon 10 standard marks.