AILET has the following sections:

English: Fill in the Blanks, Comprehension passages, Antonyms, Synonyms, Idioms and Phrases, Jumble words and Sentences, Choosing the correct words

Elementary Mathematics: Algebra, Profit and Loss, Time and Work, Average, Speed and Distance, Permutation-Combination, Numerical Ability

General Knowledge: Economics, Civics, Current Affairs, History, Geography, General Science

Reasoning: Logical and Analytical reasoning skills

Legal Aptitude: Study of Law, Research Aptitude and Problem solving ability.

Now CLAT hs following sections:

English:

You will be given passages of about 450 words. These passages are usually from Contemporary or Historically signification fiction and nonfiction writing. The standard would be of 12th standard student. So each Passage has a series of questions which will check your Comprehension and language skills. You will be required to Read and comprehend the main point discussed in the passage. Draw Inferences and conclusions based on the passage. Summarise the passage. You will have to compare and contrast the different viewpoints set out in the passage. You will have to understand the meaning of various words and phrases used in the passage.

Current Affairs including General Knowledge: You will be given passages of upto 450 words and these passages are usually taken from News, Journalistic sources and nonfiction writing. The questions may include legal information or knowledge but do not need any additional knowledge of the law beyond the passage. This sections requires you to demonstrate knowledge of various aspects of current affairs and general knowledge including Contemporary events of significance at National and International Level, Arts and Culture, International Affairs and Historical Events.

Logical Reasoning section consists of Short passages of about 300 words each. You have to recognise an argument, its premises and conclusions. You have to read and identify the arguments set out in a passage. Critically analyse the patterns of reasoning and assess how conclusions may depend on particular premises or evidence. You have to infer what follows from the passage and draw relationships and analogies, identify contradictions and equivalence.

Legal Reasoning section has passages of 450 words each which may relate to fact situations or scenarios involving legal matters, public policy questions or moral philosophical enquiries. You need not require any prior legal knowledge. General awareness will do. Yuo have to idenify and infer the rules and passages set out in the passage and apply those rules to various fact situations and understand how changes to the rules or principles may alter the application to various fact situations.

Quantitative Techniques section includes short set of facts or prepositions, graphs, or other textual, pictorial or diagrammatic representations of numerical information followed by a series of questions. You need to apply 10th standard mathematical operations on ratios and proportions, basic algebra, mensuration and statistical estimation.

So the syllabus is pretty much the same and preparing for CLAT will get you ready for AILET and viceversa.