Hello aspirant,
ITI students have two main options that are available to them, i.e., either go for further studies or explore job opportunities. Both these options have their own advantages as discussed below:

1.Further Studies
Diploma Courses: For students who have undergone ITI training in technical trades or engineering domains, there are several engineering diploma courses available. Unlike the ITI courses, the diploma engineering courses go in the details of the respective subject covering both theoretical as well as practical aspects of the domain.
Specialized Short Term Courses: For ITI students from certain specific trades, the Advanced Training Institutes (ATI) offer specialized short-term courses. These courses help students hone their skills further, specific to the job profiles or industry requirements in the respective domains.
All India Trade Test: Another option for ITI students after the completion of ITI course is to go for AITT or All India Trade Test. The All India Trade Test is conducted by the NCVT (National Council for Vocational Training ). The exam is a skill test that certifies the ITI students. After passing AITT, students are awarded National Trade Certificate (NTC) in concerning trade by NCVT. In many engineering trades, an NTC is equivalent to diploma degree.
2. Job Opportunities

Just like other professional and vocational courses institute, even ITIs have dedicated placement cells which look after placement of students. These placement cells have tie-ups with various governmental organizations, private companies and even foreign companies, who hire the students for jobs in several trades.

A. Job in Public Sector
The biggest employer of ITI students is the public sector or the government agencies. Students who have completed their ITI can seek employment with various Public Sector Units / PSUs such as Railways, Telecom / BSNL, IOCL, ONCG, State-wise PWDs and others. In addition to this, they can also explore career opportunities with the Indian Armed Forces i.e. Indian Army. Indian Navy, Air force, BSF, CRPF and other paramilitary forces.

B. Jobs in Private Sector
Private sector, especially the ones dealing in manufacturing and mechanics seek out ITI students for trade specific jobs. The key sectors in which ITI students can find lucrative career opportunities include construction, agriculture, textiles, energy. As far as specific job profiles are concerned, electronics, welding refrigeration and air-conditioner mechanic are the most sought-after skills in an ITI student in the private sector.
Hope it helps ,thank you.