As you have not mentioned your rank ,percentile, category/caste, which college you want or which exam you scored 124 marks in it is a bit difficult to predict if you will get a seat or not based on the information provided as the cutoffs for colleges change every year. If you are talking about JEE Mains you can visit the below college predictor and provide all the necessary information asked to predict all the colleges you can get a cse branch seat in:-