The sources and preparation strategies that should be followed for cracking DU JAT BMS are mentioned below: 

• Quantitative Ability: 

1. NCERT XI-XII: This is the most important source you must thoroughly review in order to have a good chance of receiving SSCBS. Modern math accounts for 70% of the total questions asked in this section, which covers topics from classes XI-XII. Complex numbers, probability, P&C, matrices, differentiation, and arithmetic progressions are the most important topics.

2. Objective Math textbook: Basic mathematics accounts for 30% of the quant section and includes topics such as time, speed, distance, averages, percentages, ratios, and proportions. 

3. Brush up on your Calculation: Being fast is the simplest way to get ahead of the competition. Make sure you understand squares up to 30, cubes up to 20, and can quickly add and multiply two and three-digit numbers. This would give you a competitive advantage.

• General/ Business Awareness:

1. Newspaper: Make it a habit to read the newspaper for at least an hour every day. Reading the whole thing is not necessary. Sports, economics, world news, and editorials are the most important sections. 

2. App Jagran Josh: It is the best online resource for improving your general knowledge and growing as a person in general. It publishes weekly current events and quizzes based on them, which aids in thorough preparation. You can also read monthly current affairs to get a detailed overview of the month. Make sure you read up on current events at least 7 months before the exam date.

3. Google searches: The best thing to get ahead of others was to conduct specific Google searches. Make separate lists and thoroughly revise the important topics that appear frequently in JAT (national parks, geographical features, awards and honors, taglines).

4. Pearson publication: Static GK is becoming increasingly important for acing the exam, so it is necessary to prepare for this section. You could use any static GK book. The Pearson book, on the other hand, is excellent. 

• Verbal Ability:

1. Norman Lewis's Word Power: It is the best book for acknowledging your language skills even at the CAT level. The first half of the book based on word roots is less significant (very crucial in general) at the JAT level, and the second half of the book with a list of difficult words is the most essential component. Figure out how to learn those odd 800 words, and you'll be able to find keywords from the list.

2. Bakshi, SP English objective: It is an excellent resource for preparing homonyms, antonyms, and synonyms. Also the best book for practicing one-word substitutions and idioms, which are two of the most important topics for JAT.

• Logical Reasoning: 

1. It is the simplest topic to prepare for because the level of LR at JAT is beginner, and you should attempt all 25 questions in this section. To adequately prepare for all adversaries, you should solve CAT beginner-level LR questions.

These resources will assist you in properly preparing for the exam. Though it is only one component, your exam taking strategy will have a significant impact on your score.