As you have not provided what is your prepration status till now so I am assuming that you are done with your syllabus and now the revision is going on so you are advised to practice sample and previous year papers properly as this would be good to know the difficulty level of the exam and the paper pattern and once these are done then next step should be the mock papers as these will be teaching how to manage time during exam and will also let you know where all you are still lacking in your preparation. Also, practising mock papers will only help you in a right direction if you check the test analysis report properly and work on your weak areas in a proper way.

Lastly, if you follow these tips then chances of getting more than 450 would be decent but I would say better to increase your target if you wish to get seat in good Govt college.

Good Luck!!!