The table represents marks obtained by students A, B, C, D and E in five subjects in an examination. The maximum marks for each subject are 100.



In how many subjects have the students scored 100% marks?

Since the maximum marks for each subject are $100$, scoring $100\%$ marks means scoring exactly $100$ marks.
Let's look at the columns of each subject to find where any student has scored $100$ marks:

1. English: Highest score is $94$ (No student scored $100$).
2. Math: Students A and C scored $100$ marks. (Subject counted: 1)
3. Physics: Highest score is $98$ (No student scored $100$).
4. Chemistry: Student A scored $100$ marks. (Subject counted: 2)
5. Information Technology: Students A and C scored $100$ marks. (Subject counted: 3)

The question asks for the number of distinct subjects in which the students have scored $100\%$ marks. Those subjects are Math, Chemistry, and Information Technology.

Thus, there are $3$ subjects in total.