CAT

IMS Learning Centre has been nationally preparing students for entrance tests at all levels since 1977. It has been a constant endeavor of the centre to offer a successful career to candidates who either want to pursue MBA in IIMs through the CAT/XAT/MAT test or others who want to secure an employment in the public sector banks through or other government departments by appearing for exams like IBPS PO, IBPS Clerical, SBI PO, SBI Clerical, SSC CGL, RRB, IBPS RRB, IBPS Specialist Officers, etc. And I'm from Assam, IMS-Guwahati is the best coaching institute having a dominating presence in Guwahati with two centres. IMS Guwahati comprises of a team of mentors who are alumni of premier institutes like IIM-Ahmedabad, IIT-Bombay, XLRI Jamshedpur, etc. The centre has produced all India toppers in all India based competitive exams like CAT MAT & XAT. Over 600 students have successfully secured jobs through various bank exams and other government exams like IBPS PO, IBPS Clerical, SBI PO, SBI Clerical, RBI, SSC CGL, and other exams for government jobs after coaching in IMS Guwahati centre. Well researched study materials, personalised mentoring and online learning resources are hallmarks of our training programs, making IMS Guwahati the best coaching institute of Assam. And you know IMS Guwahati has excellent results by students in CAT 2017. Students selected in IIM Ahmedabad, IIM Calcutta, IIM Lucknow, IIM Shillong, IIM Kozhikode, IIM Indore, IIM Ranchi, IIM Trichy, IIM Udaipur, IIM Rohtak, IIM Sambhalpur, IIM Raipur, IIM Kashipur, MDI Gurgaon, S. P Jain, NMIMS, etc. Once again the best results in the northeast from IMS Guwahati. Students from Gauhati Commerce College, K. C Das Commerce College, Cotton College, AEC, GIMT, Tezpur University, GU-IST, Handique Girls College, Dhemaji College, Dibrugarh University, NIT, Darrang College, etc. Have secured seats in the top 20 MBA institutes of the country. So I don't think that IMS learning centres are not good actually they are the top institute's centres in India which I have mentioned one of the best coaching centres of IMS from my state that is IMS-Guwahati.

Syllabus is almost similar for both, SNAP has extra section of general awareness.
SNAP syllabus- Quantitative, Data Interpretation and Data Sufficiency
Analytical and Logical Reasoning
General English: Reading Comprehension, Verbal Reasoning, Verbal Ability
General Awareness: General Knowledge, Current Affairs, Business Scenario
CAT Verbal and Reading Comprehension (VARC)
Reading Comprehension - The Reading Comprehension passages are generally of medium length, carrying 250 to 500 words. Question types can be both direct or inferential.
English Language - Fact Inference, Judgment, Fill in the blanks, Grammar, Para Completion, Para Jumble, Sentence Correction, Verbal Reasoning, Analogies and Reverse Analogies, Synonyms Antonyms (Vocabulary Based), etc.
Data Interpretation and Logical Reasoning (DI & LR) and Quantitative Ability.

Common Admission Test CAT is national-level management entrance examination conducted by the Indian Institutes of Management (IIM). Apart from 20 IIMS, CAT scores are used for admission to various management institutes across the country. CAT 2017 was conducted successfully on November 26, 2017 (Sunday). The exam was conducted by IIM Lucknow. Eligibility criteria for CAT 2018:
The candidate must possess a Bachelor's Degree with at least 50% marks or equivalent CGPA (45% for SC, ST and PWD/DA category). Percentage obtained in Bachelor's degree would be calculated on the basis of practice followed by the concerned university/institution. In case of grades/CGPA, the conversion would be based on the process defined by the concerned university/ institution. In absence of any percentage conversion scheme, candidates CGPA will be divided by maximum possible CGPA and multiplying the result with 100. Candidates appearing for the final year of Bachelor's degree/equivalent qualification are also eligible to apply for CAT. Also check the below link for exam pattern and syllabus-
https://www.shiksha.com/mba/exams/cat.