WRITTEN TEST SYLLABUS IN 2 MONTHS???

OKAY SO IM FROM INDIA AND I THINK I WILL SCORE AROUND 85 PERCENTAGE IN MY 12TH RESULT, AND I SCORED 86 IN 10TH THE ONLY THING THAT BOTHERS ME IS THAT IN 11TH IT WAS 48% FOR SOME REASONS DOES THAT AFFECT MY DOCUMENTS SCREENING A LITTLE OR A LOT?? AND ALSO LIKE MY 11TH BASICS ARENT THAT BAD ITS JUST THAT I SCORED REALLY BAD IN MID TERMS- SO IF UR AN INDIAN I THINK U ARE AWARE OF JEE MAINS AND JEE ADVANCED RIGHT?? SO BASICALLY MY 11TH'S PHYSICS AND MATHS CONCEPTS ARE LIKE AT LEAST CLEAR JSUT A LITTLE PROBLEM WITH CHEMISTRY- AND MY 12TH'S CONCEPTS ARE CRYSTAL CLEAR TOO ITS JUST I LOSE MOTIVATION BEFORE EXAMS BUT YEAH SO IF I STUDY APRIL,MAY, AND HALF OF JUNE PROPERLY TO REVISE 11TH AND 12TH FROM THE BEGINNING AND SOLVE A LOT OF PYQS, WOULD THAT BE ENOUGH??