As per AIIMS MBBS cutoff 2019, candidates belonging to General category will be required to score at least 50% marks in AIIMS MBBS entrance exam, while those belonging to OBC category need to score at least 45% and SC/ST candidates will be required to score at least 40% in order to qualify the exam. 

The merit rank is 53.

Since the scores are not revealed on the results, the cut-offs for AIIMS are given in ranks or percentile only.

Here's a link that'll help you with the cut-offs for all the centres of AIIMS

Https://www.google.com/amp/s/medicine.careers360.com/articles/aiims-mbbs-cut-off/amp

You should be doing self study for atleast 5-6 hours everyday where you study theory for atleast 1½ hours and then keep solving MCQs for the remaining time. Keep a goal for every day and try to solve atleast 100-150 MCQs during the starting days and keep on increasing the number gradually. Keep in mind, you'll only get good scores if you have a grip over MCQs. Devote more time to the subject that you are weak in and try to make it strong. You should be knowing all the concepts well. You should be done with everything till the end of 2019 so that you have enough time to work on your weak topics.