Strategy is something that you need to design on your own. What worked for someone else may not work for you. There may be a common ground of how to go about some subject for your CLAT preparation. But no one can give you any full proof plan. You need to develop your own strategy based on your strengths and weaknesses. 

Now let’s discuss whether you can clear CLAT with one month of preparation or not. It depends on your level of preparation. 

• If you are starting from scratch, then it will be quite difficult. Since the new format of CLAT demands consistency and regularity to secure a decent score. And it takes time to get to the level of that preparation. But if you are gifted with great comprehension and reasoning skills then I guess you can prepare for the examination in one month. 
• Now if you already have a hang of the subjects but are not confident about your preparation, then I will suggest you practice as many critical reasoning questions and comprehension as you can.
• If you have missed GK for a few months catch up on it and attempt a few sample questions to get the hang of the new pattern. 
• For logical reasoning don’t just solve the sample paper released by the Consortium, solve past years’ questions too. The consortium itself acknowledged that past years’ questions can be useful. 
• For Quantitative Aptitude, solve questions from the internet or from study materials. Apart from a few questions, this section is generally easy. 

So if you have a hang of the subjects, consistent practice is the key to ace the test.