Clearly cocubes is the best after it elitmus

AMCAT now, has become money making website and will only give you jobs if you buy AMCAT pro

Jobs in CTS and NTT data which are only two good companies that hire via it are only for AMCAT pro

And it costs 2000 and isn't worth

I will say only and only give Cocubes and elitmus

However much better and detailed explanation for AMCAT vs CoCubes vs elitmus is given here. (https://prepinsta.com/amcat-vs-cocubes-vs-elitmus-which-one-is-better/)

Hi, Both are unique in their own perspectives. AMCAT is way easier than elitmus if you compare the questions. Elitmus has removed the 60% criteria for appearing. AMCAT focus on overall skills and so along with aptitude and logical reasoning, you will be tested on computer language skills (C,C++, Java,SQL), while elitmus focuses only on aptitude, logical reasoning and English. Test score of AMCAT is comprehensive. On other hand elitmus just gives you only the percentile but doesn't mention what is the cut off criteria for companies- partly because companies keep different cut off levels, but even then no one knows what's the cut off for a company.
Opportunities and Package- elitmus surely scores on this one. I have given both these tests, and the only time AMCAT offered a reputed company was Flipkart and Snapdeal, while I can list a number of such companies for elitmus (Khosla Labs, National Instruments, Intel Securities (McCafee), RBS, Citigroup, Black Rock, Barracuda etc.). And while these companies take students with good cut off, their package is also very good, probably in region of 5-7 LPA, which is very good, for a fresher.
Overall, elitmus is much tougher and better as compared to AMCAT. I would suggest you to prepare for elitmus for one and a half month and then have the first go. Don't worry about English- it's very easy. The logical and aptitude, though are hard to crack. Good Luck.