YES YOU CAN.
Step 1: Study your syllabus. There might be topics you are good at and topics you’ll Love to learn. Identify them
Step 2: Look out for previous years Question Papers. Questions get repeated most of the times. You might get an idea of important topics in each subjects and weightage through papers.
Step 3: Make a plan. Make sure you don’t study one subject for the whole day. Dividing your time for 2–3 subjects will nake sure you don’t get bored.
Step 4: START. Get going. Don’t cram. No matter what. Keep calm. 3 months is a long long time. Make sure you revise everything you study frequently. Revise your weak topics even more frequently.