You need to work on your overall English and presentation to overcome this problem.
First step, avoid sms language even on this platform or whatsapp for that matter. :) If you start writing complete words and sentences your grammar and sentence formation will improve.
For Law, Read and understand from the bare act as well, the language is simple to understand. For drafting, you can see a number of samples in the Munish bhandari handbook. For examination purposes you should practice those examples regularly to improve.