Hi,

So you need to know how you can prepare in one month for maths and physics

First of all prepare a timetable for the month with day to day goals

Secondly make yourself mentally strong and always stick to your timetable and complete your daily goals.

Don't waste your time in unimportant questions,I would suggest that you buy a question bank with solutions for both of these subjects .Then refer these question bank before you study a particular chapter.

Most importantly don't lose your confidence. The real heroes are those people who score the maximum marks in the short time they have.