It is not at all correct to pressurize children for studies. Bring strict with them is another thing, but when you pressurize them to do what they don’t want to do they become even more stubborn.
When you impose your wishes and expectations upon them, they feel burdened, as if it’s your life not theirs. Don’t ask them to score 80 above in all the subjects. Tell them that if they are scoring 90 in Science, it’s okay to score 50 in English or Maths. Tell them they are free to study whatever they want.
Also, don’t make your children feel that co-curricular activities like dance, music, writing, etc., are futile.
In fact, support them if they show interest in such things. Their school bag is too small to carry the dreams they have for themselves. Let those dreams develop and grow with them, instead of imposing your dreams on them. All they need is the support of their parents and guardians. Let them take it easy and enjoy their childhood while they have it.
