If you are not confidence in physics and chemistry,then you should give more time in physics and chemistry.
work hard,follow good books.Just stay calm and focus on understanding rather than mugging. Be regular in class and stay with concepts.Refer good books.
these All india test series paper is condected to provide the student a plateform in which student can compair his prepration level with other student.it also give provide a practice session before the actual exam of iit jee.
Try to do well in AITS. It will boost your confidence level.
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All the best Abhenandan.