Question

you could regularly study if you wish to do well in the exams (correct the sentence)​

Answer 1

If you wish to do well in the exams you should study regularly.

Answer 2

Answer:

You should study regularly if you wish to do well in the exams.

Explanation:

The reason we use 'should' and not 'could' is because the above statement is not a suggestion, instead it is an assertion.

For suggestions, we can use phrases like can, could, had better, may, might.

For assertions, we use phrases like should, must and ought to.

Eg. Can you help me?

You must listen to your mother.

I had better go now, which means, one is politely suggesting that he/she will leave.

I should go now, which means, one is going to leave irrespective of the other person's opinions.

Studying tones of sentences will help in these kinds of questions.