The ICSE grading system is mentioned below:

• 90+    A
• 75-89   B
• 60-74    C
• 40 -59   D
• Less than 40    E

Check the ICSE board Result here- https://school.careers360.com/boards/cisce/icse-10th-result

Dear student, grading system is that if you secure over 90% you will get A grade everywhere in India. But if you are even little below than that, you will be allotted B grade till 81% in class 10. The grading rules may change in some of the private schools as they consider 95+ as A grade.

Hey sandeep!

The ICSE grading system is as follows:

 90+    A 

75-89   B

60-74    C

40 -59   D 

Less than 40    E 

So , as your percentage lies between 75-89 , your grade is B and in terms of grade point , it is 2.

Hope it helps!

Dear Aspirant,

If you score less than 90% then your grade becomes a grade 2. And also 

A - 90+

B - 80-90

C - 70-80

D - 60-70

E - 50-60

So according to this, you score grade B

Good luck