Yes, you will have to fill up again but not the complete application form. You will be required to login through your application number and password (which you got after registering for Jan attempt). After logging in into the portal, you will be required to select the exams in which you wish to appear in April attempt. The final step will be to pay the required application fee.

Definitely yes, if you are looking forward to write the exam again in April then you will have to register for the exam again.
Now since you are asking regarding the April exam I'll assume that you have already appeared on the January test and have not performed satisfactorily.

Be happy that you have another chance and make sure to make use of it to the fullest. Now since you have an idea of how the test will be, make sure to work on your time management skills.

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