Geetanjali Personally I didnt study, but I would definitely recommend writing practice essays and implementing personal time constraints on tests at school (I.e, you have 50 minutes for a math test -- try be done within 30 minutes). When sitting the exam, I recommend answering the questions you can, and flagging the ones you dont know the answer to within 20 seconds. Then, at the end go through and use the remaining time to try solve them.
For the writing portion, I personally wrote a page for the persuasive piece (which took me about 12 minutes), and one and a half pages for the creative (≈15 minutes). Definitely practice 'showing not telling' skills, and I recommend starting with the piece that you are least confident with. I wouldn't stress about making time to edit and revise, just try your best to have alright spelling/grammar (maybe give it a quick read through in the last 5 minutes).
Sorry if this is iffy advice, Im not the best when it comes to that stuff :3