Hey Pratiksha Bodhke

IISER SCB complete the entire syllabus properly and thouroughly .Focusing on main topics is waste because few if you depend only on specific chapters, if the questions come from other chapters what will you do? So complete all the topics properly.Practice lots of questions Given in text books.Practice lot of online mock papers.Prepare your schedule and study regularly based on the schedule! still there is so much of time available for IISER SCB Aptitude test.

All the best!