There is no sectional cutoff in IBSAT entrance exam.

Reading Comprehension in IBSAT is the section which tests comprehensive and reading skills of the candidate. It can be confusing and to excel in it develop a regular reading habit. Solving passages is also good way of improvement in this section. You can score good marks easily. Some sources to help you in this section and to enhance your comprehension skills are - Reading newspaper, editorials, magazines, articles etc.

Make sure you go through the previous years IBSAT question papers, it is noticed that IBSAT often gives very lengthy passages in this section. And for this a quick reading speed is required.

For verbal ability preparartion, IBSAT judges your English. Reading newspaper, editorials, magazines, articles again will help you in this section too. You will have to go to the basic preparation that is grammar knowledge because in this section this is the important factor.

Therefore, Practice grammar based topics such as nouns, verbs, pronouns, adjectives, adverbs, punctuations, tenses, English usage, para jumble, replace the missing words etc. 

Good Luck.