Dear Aspirant, apart from college placements, it depends on your stream and area of interest. Choose your area of interest and develop the skillset required. Suppose you want to go in the developing field, for that brush up your coding skills. Meanwhile there are opportunities like marketing and content writing if you have interest in same. Also to get into IIMs, cat score is the key, based on the score and your previous history of marks you will be called for the interview. Having co- curricular certificates will be cherry on the cake. For gap years, you can choose an easy work from home sort of paid internship or do certified courses available on online platform like Coursera, udemy. All the best.