Hi, CLAT is one of the main exam for law studies. There are 5 sections in the exam. For every section you can prepare smartly.
1. For English, time consuming sections are RC, jumbled sentences. You can read newspapers (The Hindu), read novels, memorize new words and use them in daily conversation. One of the important reference for English preparation is 'Word power Made Easy' by Norman Lewis.
2.  In GK, go through Jagran Josh and newspapers daily. You can refer to Arihant material. In fact, Pratiyogita Darpan is also good for static and current affairs.
3. Logical reasoning section is time consuming and can be achieved by lot of practice. You will have to give dedicated time to this section.
4. Maths- It has elementary maths and class 10th formulas can help you to crack this section very well. It is not that difficult.
1st-Time management is what you will have to work upon.
2nd- Create a time table and work upon topics systematically.
Good luck.